In build 1101 and 1102, it seems that VRC Avatar Parameter Driver may not work correctly for a few frames after avatar loading.
I made a small Animator Controller to reproduce this problem.
This Animator Controller contains two layers:
  • Layer0: This layer writes 1 to the local parameter
    Local
    .
  • Layer1: This layer counts the number of frames it took for the parameter
    Local
    to be changed.
I think that Layer1 should stop at state 0 because modified values will be observable immediately, but actually it stops at state 2. This behavior is different from older builds.