On a page with recovered autosaved changes, using Ctrl+Z to undo clears the DM selection (and CE selection is desynchronized).

The most annoying effect of this is that pressing Ctrl+Z again does nothing (until you click on the surface to focus it). It doesn't happen when editing a page normally, only if autosaved changes have been recovered on it.

Recording below shows it happening. Every time the selection becomes null, it's because I pressed Ctrl+Z to undo.

In T85470#4579187, @AfroThundr3007730 wrote:

As far as the undo stack not being preserved issue, I've found that the full history is actually preserved, but for some reason, after a few Ctrl+Zs, the editor stops responding to my Ctrl+Z until I spam it several more times. Then it continues to back up through the history. Weird, but it seems to work. I don't think it's lag or anything, since undo works immediately from the current editing session, over dozens of changes.