Frequency: Always
Class/Level: White Mage (Potentially Dragoon; untested)
Party or solo: Either
Description:
Upon using certain skills or performing certain actions (general animation actions; not just involving combat), the player character will attempt to transition into the 1.0 and Alpha ARR Idle animation. This is due to the drastic changes in the idle animation for White Mage between then and the final release of ARR.

This may or may not apply to Dragoon, who had similar animation changes; i have not tested this, however. I'll reply with further progress should i find otherwise.

As for White Mage, the first case i noticed this was with the skill Esuna; i haven't explicitly noticed it with other skills. I will have to test this. This also happens when unsheathing your weapon whilst slow-walking.

I suggest either re-implementing the original Idle animation after using those specific skills or in general, or re-animating those specific skills. This isn't a pressing matter however, nor does it hinder gameplay. As such, neither outcome is entirely necessary.