This is one of the rare instances I'm not sure they owe compensation. This isn't an example of them missing on the balance, then "fixing" it in a way that hurts the player. This is a clear bug that was giving unintended buffs to the player, which they're simply correcting. They also informed us very early on that this bug was present (might have even been the day it launched?) and that they'd be fixing it. Did you miss that notice?
You could argue they should notify the player in-game of this stuff, though. Not everyone peruses the forum, YouTube videos or Discord SWGoH news.