This bug occurs when more than one level references the sublevel.

Occurs in 4.18P4 CL 3676890
Unable to reproduce in 4.17.
This is a regression.

Steps to Reproduce
  1. Create new Blank Project, no starter content
  2. Create 3 levels named A,B,and C
  3. Save All
  4. Open Level B, make Level A a sublevel of Level B in Levels Panel
  5. Open Level C, make Level A a sublevel of Level C in Levels Panel
  6. Open Level A and place a few Actors within it
  7. Save All
  8. Open Level B or C, then return to Level A
  9. Delete, Cut or Rename any actor within the level

Result: Editor will "freeze" in Updating Asset References
Editor is unable to be closed normally, but does not appear as "Not Responding" in Task Manager

Expected: Selected actor will be deleted or renamed

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Affects Versions4.18
Target Fix4.18
Fix Commit3697219
Release Commit3697219
CreatedOct 12, 2017
ResolvedOct 16, 2017
UpdatedFeb 4, 2019
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