[Beta] The editor has two cursors

I wasn’t able to reproduce it, but I was able to record a little video: sometimes the editor has two cursors:

TwoCursors

After recording this I clicked on another tab that was already open and there were two cursors.
I clicked on another tab that was already open, and there were two cursors.
I clicked on another tab that was already open, and there was one cursor. After this the second cursor didn’t come back.

This is not the first time I see two cursors in the beta editor.

It happened again.
This time the second cursor was on row 25 in a file with 21 lines of code.
It happened after I pressed Ctrl+Z while I was editing a repeating panel template.
It may be related to the undo or to the editing in place.