Using hook_menu_local_tasks_alter is possible to alter the local tasks before they are rendered, but the access checks are being done before this hook and some of them use the route_match to check entity access, this produces weird errors with custom local tasks coming from different entities than the entity referenced in the current route.
Those local tasks from different entities are included due to the $base_routes from function getLocalTasksForRoute in the LocalTaskManager.
Create a new hook called hook_menu_tasks_build_alter useful for really unset local tasks without cheking their access.
Needs work
10.1 ✨
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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This still likes it could be relevant for D10
At this time we will need a D10 version
Tagging for tests to show this issue
Thanks!