This seems to be the same issue reported in #1050832. The problem seems to be a regression in xarray v2023.08. The update to xarray > 2023.08 should fix the issue. See also https://github.com/bopen/sarsen/issues/54.
I will reassign to xarray. [#1050832] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1050832 -- Antonio Valentino