I wonder if it's something as easy a dictionary getting unlinked? Settings for Telegram? This, bizarrely happened in my biz gmail acct where I have to appear smart...made gmail talk to the dictionary again (something like that) then voila red lines all over the place reminding me to right-click and disguise my crappy typing...
... I had hunspell fail to acknowledge an app it was previously friends with (or vice versa) before, too.
Go here to see if it's an existing problem or ask if they can take a look:
https://dev.getsol.us/