Editor freeze on adding key in additive sequence pose

Summary

Adding a key in a pose animation using as additive to several other animations, completely freeze editor

What Type of Bug are you experiencing?

Animation

Steps to Reproduce

  • create project with old ALSv4 system
  • retarget all animation and animation blueprint to SK_Manny skeleton from sample project
  • fix the additive animation source (after the retarget some don’t have the correct source)
  • try modify a bone and add a key in ALS_N_Pose sequence and save

Expected Result

Sequence modified correctly

Observed Result

Editor completly freeze without crash. Only option is killing the process

Affects Versions

5.8

Platform(s)

Windows