Fedora has issued an advisory today (September 7):
The issue is fixed upstream in 8.2.3402:
I'm not sure if neovim is affected.
Fixed upstream in 8.2.3402
New vim package:
i took a look and seems this is not valid on neovim.
Fixed upstream in 8.2.3402 =>
Updated the four packages.
vim working as expected; mode switching, keystroke commands, copy&paste. Tried :q, :q! and :wq exit commands.
Tried editing filelist and using the :next command - worked fine.
Tried unfamiliar commands like search back (:?pattern) and forwards (;/). Looks like those work.
Researched tags but found they apply to code only and come in several varieties. Not today thank you.
This looks OK for 64-bits.