That seems to be the case for me, at least. Using a 8.1 save with SanchoMod. No idea if you need or want to see this, just tagging you in case you do
Sancho1969 If not, please just get back to your whiskey.
8.5 without the 8.1 mod gives me a traceback on loading a save from the end of 8.1, ignoring it starts a new playthrough and rolling back crashes the game.
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8.5 with the 8.1 SanchoMod loads the save, I have to click a few times to advance (nothing happens at first) then the game ends as it would in 8.1, I don't get to the new scene.
All the saves tested were manual saves, not quick or auto if that matters.