The Lexica Botania is a Patchouli-based book, which uses invisible advancements to track progress, both for unlocking entries and for removing the entry marker for things you are supposed to do next. There are some "performance" mods that just kill certain types of advancement triggers, especially those that keep track of new items entering the player inventory, or don't send unlocked advancements to the client. These are necessary for "obtain these items" checks for lexicon progress.
You may want to file a bug report with that mod pack's developer so they either disable the features that prevent advancement tracking, or unlock the book of Patchouli-based mods by default. (The former would be preferred for the progression experience of Patchouli-using mods.)
In the meantime, you can also edit your Patchouli configuration to activate the setting disableAdvancementLocking.