See if this leads to the error

app/Http/Controllers/ProjectController.php

@@ -115,16 +115,22 @@ class ProjectController extends Controller
     ): RedirectResponse {
 
         $user = $request->user();
-
         abort_unless(
             $this->projectPermissionService->userCanManageProjectAccess($user, $project),
             403,
         );
 
-        $this->projectPermissionService->syncUserPermissions($project, $user, $request->permissions());
+        $validated = $request->validated();
+        $permissions = collect(Arr::get($validated, 'permissions'))
+            ->map(fn (mixed $permission): string => (string) $permission)
+            ->unique()
+            ->values()
+            ->all();
+
+        $this->projectPermissionService->syncUserPermissions($project, $user, $permissions);
 
         return to_route('projects.access', $project)
-            ->with('status', "{$user->name} permissions were updated.");
+            ->with('status', "Regular User permissions were updated.");
     }
 
     public function updateTeamPermissions(
@@ -137,7 +143,14 @@ class ProjectController extends Controller
             403,
         );
 
-        $this->projectPermissionService->syncTeamPermissions($project, $team, $request->permissions());
+        $validated = $request->validated();
+        $permissions = collect(Arr::get($validated, 'permissions'))
+            ->map(fn (mixed $permission): string => (string) $permission)
+            ->unique()
+            ->values()
+            ->all();
+
+        $this->projectPermissionService->syncTeamPermissions($project, $team, $permissions);
 
         return to_route('projects.access', $project)
             ->with('status', "{$team->name} permissions were updated.");

app/Http/Requests/SyncProjectPermissionsRequest.php

@@ -33,13 +33,6 @@ class SyncProjectPermissionsRequest extends FormRequest
         ];
     }
 
-    public function permissions(): array
+
-    {
-        return collect($this->validated('permissions', []))
-            ->map(fn (mixed $permission): string => (string) $permission)
-            ->unique()
-            ->values()
-            ->all();
-    }
 
 }