When entering an arena, GladiusEx enemy arena frames are in the default unsorted order (despite having Enemy Arena ordering enabled in FrameSort).
Upon the gates opening when the match starts they become sorted.

It'd be ideal if they were sorted before the gates open.

To compare, sArena seems to be sorted on entering the arena (and before gates open).

Maybe FrameSort is handling ARENA_OPPONENT_UPDATE/ARENA_PREP_OPPONENT_SPECIALIZATIONS events before GladiusEx has had a chance to process them and update their frames. If this is the case, then need to figure out some way to run after GladiusEx has processed.

Guessing sArena works just by pure luck and I should also apply a similar fix to it.

Fixed in release 5.6.6 by waiting until after an event update to allow GladiusEx/sArena to update their frames before sorting them.