Sometimes it's good without, I personally disable every time "Check spelling and grammar" they give me many unwanted auto-correction issues (also in this thread) in typing, when using Notes, but especially handling with apple scripts in TextEdit, a disaster.
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faulty MagicMouse1 ? Water damage ?
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You have to replace all the 5 IOUSB***.kext from HighSierra into Mojave /S/L/E/
If you don't have more HighSierra check here: 5 IOUSB kexts by @TimothyR734
right after you must fix permissions in /S/L/E/ and rebuild the kextcache from Mojave Terminal:
sudo -s
chown -r 0:0 /System/Library/Extensions
chmod -r 755 /System/Library/Extensions
kextcache -i /
reboot
Use with care, I bricked an install trying this.
But in the process after having to reinstall Mojave, I then ran the post installation again, checked all the boxes and clicked force cache rebuild, when I restarted my iSight camera was working!