After some typing (some text, 1 link, 1 emoji no undos or anything like that) the editor started to repeat only the last character, despite the fact that I was pressing different printable characters.
It was just substituting the pressed key with character that was a last character in existing content and appending it (in my initial case that was simply empty space).
Happened for the following data (so you can see not much formatting):

Funny thing that as I started to record GIF for this I discovered that it repeats tailing character rather than doing only non breaking spaces (as opposed to what I initially thought).
Here's the screencast (I was mashing random keys but the editor kept repeating last letter):

The console is clean, there's no bleeding there.
I know that this is yet another kind of an issue like "xyz" happens when using the product, but I really don't have more repro data on that (though it's the first time I see this issue for a long time).
Chrome 80 @ Win10
After some typing (some text, 1 link, 1 emoji no undos or anything like that) the editor started to repeat only the last character, despite the fact that I was pressing different printable characters.
It was just substituting the pressed key with character that was a last character in existing content and appending it (in my initial case that was simply empty space).
Happened for the following data (so you can see not much formatting):
Funny thing that as I started to record GIF for this I discovered that it repeats tailing character rather than doing only non breaking spaces (as opposed to what I initially thought).
Here's the screencast (I was mashing random keys but the editor kept repeating last letter):
The console is clean, there's no bleeding there.
I know that this is yet another kind of an issue like "xyz" happens when using the product, but I really don't have more repro data on that (though it's the first time I see this issue for a long time).
Chrome 80 @ Win10