Comment # 27 on bug 1165780 from Franck Bui

(In reply to Karl Mistelberger from comment #26)
> With a fresh install of Tumbleweed 20200416 the problem no longer persists.
> Units
> btrfsmaintenance-refresh.path and btrfsmaintenance-refresh.service indeed
> wait until local-fs.target is reached.

That should have always been the case otherwise that would be a bug.

> 
> However due to btrfsmaintenance-refresh.service being enabled the unit runs
> during boot without /etc/sysconfig/btrfsmaintenance being changed:
> 
> [...]
> 
> Disabling btrfsmaintenance-refresh.service and enabling
> btrfsmaintenance-refresh.path fixes this:
> 

Which is the reason why I asked the point of enabling btrfsmaintenance service
in comment #18.

Actually this service doesn't seem to need a [Install] section at all.