[i can't provide a crashlog client but can be easly replicable]

How to reproduce :

• Open a world with reactive and jei installed
• find a recipe with any source used on jei
• press "A" (or the bookmark key used to save) on top of the source of recipe like reactive:soul
• look on bookmarks by move the cursor over the source saved
• the game crash

tested on 1.19.2 modded

also on bookmark.ini from jei the element still saved as O:soul

Ah! Interesting, thanks for the report.

Fixed in 1.19.2-7b and 1.20.1-7d