Ability buttons disappear in SLKR vs. GL Ahsoka battles

When attacking a GL Ahsoka team with a SLKR team in GAC, the basic/special ability buttons disappear, effectively hanging the battle until the timer runs out. This has happened twice now in the current 5v5 GAC season and cost me the win on both matchups. 

Reproduction steps:

1. Enter a 5v5 GAC matchup
2. Find a GL Ahsoka team on opponent's defense
3. Attack GL Ahsoka using SLKR (my team was SLKR/KRU/Hux/FOO/Dark Rey)
4. ??? 
5. Ability buttons disappear mid battle

Observations:

• SLKR was in ult stance both times the buttons disappeared
• I believe it was supposed to be SLKR's turn (in ult stance) when the buttons disappeared
• The buttons disappeared immediately after GL Ahsoka had countered the preceding First Order ally's attack against her
• Some character animations seemed to lag in the few seconds leading up to the buttons disappearing