Date & Time: A video uploaded yesturday shows the bug. The fight is from Alexander The Soul of the Creator (Savage) with Echo so it was recently. Here is the link to the video at the time that they use LB3.

Frequency: I have not experienced it but I'm guessing it would be all the time. So Always I guess.

Class/Level: Marauder

Party or Solo: 8 player party in trial/raid for 3 bar limit gauge to appear.

Steps:

1) Choose to be a DoW or DoM class and not a job.
2) Enter a Trial or Raid as an 8 player team.
3) Fight the boss until you gain 3 LB bars.
4) Use LB as the class.

Observed Results: The class does a level 3 limit break.

Expected Results: Classes would do a level 2 limit break since level 3 limit breaks are meant to be Job only based on the 3.0 patch notes.