Fix the animation glitch when NSSL adds and removes a HUN in the same frame.

Bug: 185680162
Fixes: 213876313
Test: visual inspection when legacy pipeline initiates a group alert transfer
(cherry picked from commit 35720797)
(cherry picked from commit f87c4e7b)
(cherry picked from commit 878e9322)
Merged-In: I755fff6944da0699d9cb7e6b2456e4811f7888d5
Change-Id: I755fff6944da0699d9cb7e6b2456e4811f7888d5