This superscript in another post mentions briefly at the bottom in that Beehaw ran into a critical bug in v0.18 which is preventing the upgrade right now.
Same issue here. I've sent feedback to Developer. It was starting with a minimum version warning but now I see the changelog screen briefly before it crashes and burns. I guess that's the price of living at the bleeding edge of the fediverse ;) In the meantime I'm back to Vivaldi mobile.