Hi Jules,
Just to let you know that we had a discussion with the CARRA team and indeed we need to understand the problem better and document it afterwards. This study would include to look at orography, land-sea mask and similar fixed fields too.
There is another related issue reported in this Forum: Carra snow depth variable changes level type at midnight june 30th 2022
Contrary, what I said above the change happens for data July 2022 (not 2021) onwards.
Thanks, best regards
Andras