Have you considered storing as a Map instead?

MDN Map docs

The three dot menu in the top bar has a scroll to top button in it

I had two instances logged in, lemmy.world and beehaw.org. I was able to fix lemmy.world by removing it and logging back in.

Beehaw.org seems to be down and if it was the first one liftoff tried loading nothing would load. I had to just remove it fully from liftoff