Hey,
i have a plugin named harry potter economy for my chatformat and if i install luckperms the chatformat dissapear for no reason here are some screenshots
without luckperms

with luckperms:

Error in console:
https://pastebin.com/Ta6MMLS3

Note that LuckPerms isnt blocking the other plugin. From the errors you sent, it seems like harry potter economy plugin is not using the luckperms API correctly.

LuckPerms doesn't modify the chat directly.