landscape render crash

Trying out 4.24, flatten tool on very high terrain, and while sculpting was working great, when I wanted to right click>play here, it hesitated,and 15 sec’s or so later I got this:
Assertion failed: TessellationFalloffSettings.UseTessellationComponentScreenSizeFalloff == SceneProxy->UseTessellationComponentScreenSizeFalloff [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Landscape/Private/LandscapeRender.cpp] [Line: 671]

Yes I sent but I’ve never gotten a reply TO bug , not that I expect it necessarily,but having no such errors in 4.23 this isn’t normal clearly.

Anyone else seeing this, what might fix this or a bug needing attention ?