Using 'Update Instance Transform' to rotate HISM instances will work in PIE, but won't work in a packaged game. This is a regression from 4.19.2 (CL-4033788).
This issue was reported and tested in 4.20.2 (CL-4302132). This has been reproduced in Main 4.21 (CL-4305553)
Results: Instances don't rotate in packaged game.
Expected: Instances rotate in packaged game.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-63242 in the post.