Cannot find child entity of parent "Root" - Editor error, can't delete entities

Hi, I somehow reproduce this issue in a simple way.

  1. Create an empty Entity named “child” and make a new template from this.
  2. Create another empty Entity named “parent” and attach “child” to “parent” as a child entity and duplicate “child”, then make a new template from this.
  3. Duplicate “parent”. At this point, duplicated “parent” has 2 “child” which has diff “+child/-child”. (there is no diffs on “parent” entity, but 2 diffs on “child” entity, I don’t know why)
  4. Do “REVERT ALL” to one of “child” entities. You can see “child” entity deleted on the “parent” entity that is NOT duplicated.
  5. Delete the “child” entity which is on the DUPLICATED “parent” and which you did “REVERT ALL”.

I think you can’t delete any entity after these procedure.

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