talking to petra didn't work for me
killing the dummies didn't work for me
choosing a new territory to attack on the alliance map didn't work for me

what DID work was the following

1. -> sleep in your bed at ravensthorpe
2. -> meditate
3. -> fixed it for me after meditating, saves now work again!

talking to petra didn't work for me
killing the dummies didn't work for me
choosing a new territory to attack on the alliance map didn't work for me

what DID work was the following

1. -> sleep in your bed at ravensthorpe
2. -> meditate
3. -> fixed it for me after meditating, saves now work again!

@jadennn89 but I'll have to travel 4000 km to Petra O_O

I know it doesn't help much, but I have the same issue after the patch
the game just won't save, not even after story missions, synchronization or any other things I collect or do
manual save is not available, fast travel doesn't work...
please don't make me lose my 25+ hours of playtime