Hi, some people on the Steam forums today; were linking this thread with ConcernedApe's fix. Well, yesterday morning I discovered that SMAPI is still generating bad saves in non-english languages.
And, reported it on the SMAPI nexusmods page:
https://forums.nexusmods.com/index.php?showtopic=6736682/#entry88335403
It's appending translations to the <bundleData> which is causing the crash; clearing out those translations fixes the bundle crashes. ConcernedApe's savefix which automates this; is a lot easier than editing out the translations, or transplanting in good data(as I was doing).
But, for now I'd recommend that new saves in non-english languages be created in an unmodded SDV. Then mods can be added afterwards. At least until SMAPI is properly patched.
Otherwise you'll need to apply ConcernedApe's savefix.