E.T.C. Band Manager Invalid Band Bug

x. com/PsionicBrush/status/1774929381166617044
Video for example

For some strange reason, after I disenchanted a card from E.T.C. and removed him from my deck, the deck manager still thought that E.T.C. had a band. Since the band was invalid (disenchanted card no longer owned), the game refused to let me start a game until I fixed the band. Even after the band was cleared it would prevent me from dueling. Restarting Hearthstone reveals that the band was reset, for some reason.
Further testing has shown that removing the disenchanted card does not fix the issue. Thankfully you can copy the decklist and the issue doesn’t persist through it, though.