Since 4.26 the landscape editor eventually tends to crash UE. Now with 4.26.2 this appears to have been become even worse.
With a newly created standard landscape, with or without material assigned the editor will crash after a few edits with the landscape editing tools such as sculpt, erosion, or flatten.
Perhaps someone found a trick to edit the landscape or can point to a hotfix commit? So far I am able to make 1 or 2 small edits, save the map then the editor crashes.