Entering space removes written word when autocorrect is enabled in Firefox (Mobile)

[josemariagarcia95]

Hi.

We use CodeMirror in our project, Tau Prolog, and recently one of our users pointed out this bug. When the autocorrect is enabled, you can only type single letters. If you try to type any other words, they disappear. If you disable the autocorrect, everything works fine.

We've experienced this in a Samsung Galaxy A5 2017, Android 8.0.0, using Firefox 68.1.1. This doesn't happen in Chrome, in any case.

Here's a gif of the aforementioned behaviour.