Pulsing slit cursor shortly after/during writing

[softvision-oana-arbuzov]

Ported from web bugs https://github.com/webcompat/web-bugs/issues/68863

Browser / Version: Firefox Mobile 87.0 Operating System: Android 9 Tested Another Browser: Yes Chrome

I have only firefox problem itself write this report like anywhere else pages or interface, I don't think my bad English :-D , but unexpected is: pulsing slit cursor shortly after/during writing or shuffling cursor by swifting on spacebar are elements HIDED or eraising words by left swifting on backspace blue highlight NON-HIGHLIGHTED function useful in Gboard. And unhide after again tap on place. And then erase worl After previous experience not to own a replicate issue #68729, I present some evidence to new issues https://photos.app.goo.gl/XvZitBFvsWuBHXoB9