Relics on AW defenders

Is there any specific reason why relics are locked to aw defenders for the duration of war? I can’t seem to make sense why it would be a big deal to remove relics from defenders mid war. I find myself in situations like incursions runs where I place a good relic on a champ (bullseye) who is also a defender in AW. I was trying to set up my BG deck and the relic is stuck on him for two days. 😭😭😭
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I wondered the same thing until I realized I could do that yesterday.