Historic Brawl : bug with commanders with flash and battles
All the screenshots related to my testing: https://imgur.com/a/HRwAnNi
Since the new update, anytime there is a possibility to cast a defeated battle while having a commander with Flash in the command zone, the commander bugs out and disappears from said zone.
This doesn't occur with commanders that don't have Flash (as seen in the imgur link).
Video and Repo Steps:
This bug is triggered when a battle is dealt damage to kill it and let you transform it. After casting, the UI allows an option of casting from the command zone, and from Exile, showing the commander and the battle. If the commander is not cast, after casting the battle, the commander disappears from the command zone. They will also not be present in Exile or the Graveyard.
Casting a second battle will provide the same UI a second time. This looks like it's mostly a UI bug of some sort.
This bug is reproducible with any flash commander, and any battle.