When I just renewed (not sure why it didn’t automatically renew), all my muted feeds unmuted themselves.
This is a known issue. Muting feeds and the 64 limit actually use the same mechanism. When you bounce between paid -> free -> paid, the 64 feed limit is removed and all muted feeds are unmuted. It’s not ideal, but I rewrote the Mute Feeds dialog to be a whole lot better. You can now click on folders and mute/unmute entire folders at once.
As long as it’s known, I’m good. It’s an annoyance at worst.