Save suddenly became incompatible

[MatthewMedic]

A save I have opened and edited multiple times became incompatible one day to the next.
I can't specify exactly what might have caused it but the only "new" thing I did was acquire a freighter. I've tried resaving in different places and it always seems to have the same error on load

Game is through Microsoft Store

2021-02-02 15:23:55.875 -07:00 [INF] Starting session 10... 2021-02-02 15:23:56.632 -07:00 [ERR] Could not deserialize JSON of index 0 for Microsoft: Error converting value "0xFFFFFFDEF2B5D11F" to type 'System.UInt64'. Path '6f=.RQA[516].wx7', line 1, position 956377. 2021-02-02 15:32:34.847 -07:00 [INF] Starting session 11... 2021-02-02 15:32:35.647 -07:00 [ERR] Could not deserialize JSON of index 0 for Microsoft: Error converting value "0xFFFFFFDEF2B5D11F" to type 'System.UInt64'. Path '6f=.RQA[516].wx7', line 1, position 956936.