When building in live edit and UEFN autosaves a message “saving” appears on UEFN. During that time, if you alt tab from live edit FN to UEFN, you have no control over the editor (frozen) and it lasts around a minute (every time the autosave happens). Very time consuming to work around. At times, it also stops flight in live edit, cancels the prop I am holding, then live edit shows a momentary “editor not connected”, before showing “up to date” again, without the game saving though.
Edit: This is even worse than I thought. Working in UEFN with live edit open causes an editor freeze of between 10-22 secs everytime ANYTHING is saved/moved.