List of addable templates not updated when adding template to project

[solth]

Describe the bug
When adding templates to a project using "+" buttons on the "Add template" dialog of the "Edit project" page, the list of templates is not updated, meaning the template just added to the project remains in the list of templates that can be added:

Bildschirmaufnahme.2024-10-29.um.13.47.11.mov

To Reproduce
Steps to reproduce the behavior:

1. Go to "Projects" list
2. Edit a project
3. Change to tab "Templates"
4. Add a template
5. Observe error

Expected behavior
Templates added to the project should disappear from the list of remaining templates that can be added to the project. This functionality already works correctly on the "User edit" page, where clients added to the the user in the same way templates are added to a project disappear from the list of available clients:

Bildschirmaufnahme.2024-10-29.um.13.56.49.mov

Release
all 3.x versions