Sometimes SPACE doesn't work in KB editor

Sometimes when writing or editing a KB article, it refuses to put in a space.

This has been going on for several years, across multiple computers, keyboards, browsers etc, so please don’t tell me to clear the cache.

I’m definitely hitting it - it will do it after a couple of tries, and switching to another program the space bar works perfectly all the time - it’s just that sometimes it straight up refuses to put in a space. I will see it happen, pause and even more deliberately press it, and still nothing. Typing a letter, removing it, then Space again will almost always cause it to work. I’m 100% sure it’s something in the editor.

I’ve not found any real pattern, though it seems to often occur near images, or headers, which I know does not really narrow it down.

It’s not even a huge deal, but I want to see if it’s just me, or if this is something anyone else has experienced.