Thank you for reproducing this! I've put out another hotfix (version 00.13.02) that should fix it. The grocery store in the stack is just something that happened in old saves, it shouldn't affect anything.
As far as the random weather, yeah as soon as load up an old save on version 00.13.00 or above, it's going to pick a random weather type since the current weather isn't set yet. Once you save after that the weather should be consistent with the save.