The GLAT issue is still an issue
To me, it seems to be happening when turn meter is being manipulated. Twice now in TW I have had the issue happen under the exact same circumstances.
My attack team composition was Leia, R2, Drogan, Raddus, and Jyn. The defense was GL Ahsoka, Ezra Exile, Padawan Sabine, Huyang, and Gen. Syndulla.
After GLAT reached her first ultimate, which was very quickly due to a +25% TM datacron, I attempted to use Jyn's first special to give 100% TM to Drogan. However, even though Jyn's turn "completed" and Drogan showed as having a full turn meter bar, it never actually moved to his turn. I took a screenshot of the turn meter list as well
In another instance, I'm sure that Leia had been staggered and the stagger was triggered (removing Leia's turn meter) which also lead to the issue. It really seems like turn meter manipulation after GLAT reaches ult is causing a problem