ReplaceBlock inside BlockEdit

I haven’t checked if this works any differently in V5, but I’m trying to tidy up the model tree of an imported assembly, and I want to run ReplaceBlock on some child blocks of a block being edited in-place with BlockEdit, and the operation seems to work find while I’m IN the BlockEdit mode, but once I end that, it reverts.

Hi Jim - thanks, I’ll check it.
Hm - that worked here in my simple example…