This issue has been going on for more than a year for me, probably two years. I've changed my main Android device three times but the issue persists on wrecking my experience.
The note is very big problem is that when Android's accessibility has access to such a big paragraph it freezes, which in consequence freezes the keyboard which then stops responding which then freezes the app itself.
After unfreezing it becomes extremely slow to type each character takes more than one second to appear plus the whole grammar correction collapses in huge failure.
I hope the logs attached here will be sufficient to eliminate the issue in future versions. It's so tiring and frustrating to knowing a bug has been hunting you for more than multiple years.
The logfile if bigger than 2 megabytes so you will have to download it externally = https://drive.google.com/file/d/1Z-lcZeWSAT9GJHtVsWJB6onVIQJyp6yU/view?usp=drivesdk
