Language fluency cap not working as intended

[I will never sleep]

Description of Bug Experienced:
If you hit your max cap for languages, you'll be unable to progress in any other languages. It gets frozen. DM assistance is needed to fix (which I have been denied).

Steps to reproduce the Bug:
Simply hit the fluency cap for learned languages.

Expected Result:
How it is supposed to work, from the wiki: "If you fully learn more languages than what your intelligence score can support, the oldest language will be forgotten. You can, however, start learning and abandon as many languages as you want."

Actual Result:
You cannot actually keep learning languages once you hit the fluency cap, from intelligence mod.

Additional Information/Notes
I've been told it's been this way for years, despite not being the intended way it is supposed to work. For my character, she only has 14 int, so the cap of only two extra languages is often quite restrictive, and the need changes over time. However, she can't actually change her learned languages, due to this bug.

[Itikar]

Can confirm that we tried to teach a language to OP's character and even after quite a while her percentage didn't rise even by a single point.

The teacher was fluent and the character was buffed with 5 points from fox's cunning even.