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Observed behavior

This one was spotted by @AlexVelezLl:
If I have created lessons and quizzes and assigned them to individual users, then when I soft delete even one of the users all the existing lessons and quizzes become inaccessible:

Note that if the lesson/quiz was assigned to the entire class and then one or several of the learners were soft deleted, the lessons and quizzes remain accessible. Fully deleting or recovering a soft deleted user results in being able to access the lesson/quizzes again.

Expected behavior

To be further specified.

Steps to reproduce the issue

1. Install the build from https://github.com/learningequality/kolibri/releases/tag/v0.19.0-beta0
2. Create one lesson and one quiz and assign them to individual users
3. Soft delete one or several of the users and try to view the lesson/quiz details

Usage Details

Kolibri 0.19.0b0
Windows 11, Ubuntu 22, Mac OS 15.5 - Chrome, Firefox