We just encountered a bug on the Revan 16m SM fight. When you get ported to the highest level and he's shielded the shield would not drop. We had all 16 people alive and all experienced players. We pounded on him for the full timer (140 seconds) and the shield never dropped. Eventually the cast timer expired and he knocked everyone back. About half of the raid was still alive but even though he wasn't casting anything we still could not damage him at all. We /stuck and came back and it happened again. Resetting the phase also did not fix the issue.

We split into 2 8M groups and finished with no issues.