diff --git a/tests/Features/Tia/DefaultBranchReplay.php b/tests/Features/Tia/DefaultBranchReplay.php
index e6c5efb4..4a3b6d3d 100644
--- a/tests/Features/Tia/DefaultBranchReplay.php
+++ b/tests/Features/Tia/DefaultBranchReplay.php
@@ -78,6 +78,38 @@ test('replays on a branch whose name contains slashes', function (): void {
         ->and($project->branchKeys())->toContain('feature/x/y');
 })->skipOnWindows();
 
+test('replays again once back on the default branch', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+
+    $project->snapshot();
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('replays on a new branch when tia is enabled by configuration', function (): void {
+    $project = Project::make('master', overlay: 'always-enabled');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', 'feature-x']);
+})->skipOnWindows();
+
 test('replays inside a worktree on a new branch', function (): void {
     $project = Project::make('master');
     $worktree = $project->worktree('feature-worktree');
diff --git a/tests/Features/Tia/DefaultBranchResolution.php b/tests/Features/Tia/DefaultBranchResolution.php
index 7a17aa8a..b30485b2 100644
--- a/tests/Features/Tia/DefaultBranchResolution.php
+++ b/tests/Features/Tia/DefaultBranchResolution.php
@@ -34,6 +34,22 @@ test('a declared default branch that does not exist degrades to a full run', fun
         ->and($project->branchKeys())->toBe(['master', 'feature-x']);
 })->skipOnWindows();
 
+test('a renamed default branch replays and writes under its new name', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->rename('master', 'main');
+
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', 'main'])
+        ->and($delta->baselineUntouched('master'))->toBeTrue($delta->summary())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary());
+})->skipOnWindows();
+
 test('the CI provider names the default branch where the checkout cannot', function (): void {
     $project = Project::make('master');
     $project->git()->unsetOriginHead();
diff --git a/tests/Features/Tia/DefaultBranchWriteTier.php b/tests/Features/Tia/DefaultBranchWriteTier.php
index 28f56020..dee41d6b 100644
--- a/tests/Features/Tia/DefaultBranchWriteTier.php
+++ b/tests/Features/Tia/DefaultBranchWriteTier.php
@@ -75,6 +75,40 @@ test('filtered mode finds nothing to do on a clean green feature branch', functi
         ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
 })->skipOnWindows();
 
+test('filtered mode falls back to a full replay when a cached failure cannot be located', function (): void {
+    $project = Project::make('master');
+
+    $project->seed('master', failing: ['adds two numbers']);
+
+    $project->mutateGraph(function (array $graph): array {
+        $testId = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+        $graph['baselines']['master']['results'][$testId]['file'] = 'tests/Unit/DeletedTest.php';
+
+        return $graph;
+    });
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia', '--filtered');
+
+    expect($result->output)->toContain('Some cached tests due a re-run could not be located on disk.')
+        ->and($result->output)->toContain('Running the full suite with replay instead of a filtered run.')
+        ->and($result->output)->not->toContain('No affected tests found');
+})->skipOnWindows();
+
+test('filtered mode finds nothing to do on the default branch itself', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--filtered');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('No affected tests found')
+        ->and($result->exitCode)->toBe(0, $result->describe())
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
 test('a detached HEAD replays without minting a branch key', function (): void {
     $project = Project::make('master');
     $project->seed('master');
diff --git a/tests/Fixtures/Tia/Project.php b/tests/Fixtures/Tia/Project.php
index 04b5ff3b..e5d80bc2 100644
--- a/tests/Fixtures/Tia/Project.php
+++ b/tests/Fixtures/Tia/Project.php
@@ -243,24 +243,34 @@ final class Project
     }
 
     public function sentinel(): void
+    {
+        $this->mutateGraph(function (array $graph): array {
+            foreach ($graph['baselines'] ?? [] as $branch => $baseline) {
+                foreach (array_keys($baseline['results'] ?? []) as $testId) {
+                    $graph['baselines'][$branch]['results'][$testId]['time'] = 9.999;
+
+                    if ((int) ($baseline['results'][$testId]['assertions'] ?? 0) > 0) {
+                        $graph['baselines'][$branch]['results'][$testId]['assertions'] = 42;
+                    }
+                }
+            }
+
+            return $graph;
+        });
+    }
+
+    /**
+     * @param  callable(array<string, mixed>): array<string, mixed>  $callback
+     */
+    public function mutateGraph(callable $callback): void
     {
         $graph = $this->graph();
 
         if ($graph === null) {
-            throw new RuntimeException('There is no graph to sentinel.');
+            throw new RuntimeException('There is no graph to mutate.');
         }
 
-        foreach ($graph['baselines'] ?? [] as $branch => $baseline) {
-            foreach (array_keys($baseline['results'] ?? []) as $testId) {
-                $graph['baselines'][$branch]['results'][$testId]['time'] = 9.999;
-
-                if ((int) ($baseline['results'][$testId]['assertions'] ?? 0) > 0) {
-                    $graph['baselines'][$branch]['results'][$testId]['assertions'] = 42;
-                }
-            }
-        }
-
-        $this->state()->write(Tia::KEY_GRAPH, (string) json_encode($graph, JSON_UNESCAPED_SLASHES));
+        $this->state()->write(Tia::KEY_GRAPH, (string) json_encode($callback($graph), JSON_UNESCAPED_SLASHES));
 
         $this->snapshot();
     }
diff --git a/tests/Fixtures/Tia/overlays/always-enabled/tests/Pest.php b/tests/Fixtures/Tia/overlays/always-enabled/tests/Pest.php
new file mode 100644
index 00000000..7fc02891
--- /dev/null
+++ b/tests/Fixtures/Tia/overlays/always-enabled/tests/Pest.php
@@ -0,0 +1,8 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__.'/../app/Calculator.php';
+require_once __DIR__.'/../app/Greeter.php';
+
+pest()->tia()->always();