Hey @Ardeshir_Talaei!
I just double checked on my side and you’re not missing anything. I had a quick chat with @dimitrie and we’re going to look into this today.
Meanwhile, I’m going to roll back the “chunking” of the data tree branches, which seems to be the root cause of this issue. And leave just the new data tree structure with no chunking (which will make it detach all children by default, as you’d expect).
I’ll leave the new data structure intact and make the changes backwards compatible so you can just upgrade and get the fix.
I opened an issue for the chunking part here [Core] Dynamic chunks do not detach children objects · Issue #1339 · specklesystems/speckle-sharp · GitHub
You should be getting version 2.6.1 for grasshopper and dynamo (to keep compatibility) available in your manager shortly, hopefully that will unlock you while we look into the dynamic chunking issue.