When I updated to the latest version of All of Fabric 5 (1.2.3, 5/25/2022) I lost all the progress in the book. But the progress is completed in the achievements, and in the avancemenents .json file. But everything shows at not discovered yet. I tried discovering everything again, but it doesn't work. I guess because they are marked as completed. Is there anything I can do?

I have seen that happen in AoF before, with Advancements failing to sync at login. Does the problem persist after you restart the instance and rejoin?

Yes, the problem persists. But the whole Achievements windows (L) for all mods is gone. I can only see them in the quest book.

This was caused by a bug with Charm which erased all advancements. Spectrum progress, is done based on advancements.

It was fixed in the latest release of the modpack. I thought it was a Spectrum problem, because the book of quests showed the quests as completed.

The best bugs are those, that aren't :>