I managed to get it up and running.
I added permissions for Everyone in the parent Baserow folder. The folder owner is 9999:9999, and it seems that the Redis worker with 101:102 didn’t have write access to the redis folder despite being the owner and having the appropriate permissions set. I’ll look into how to resolve this in the future. I don’t like this solution but its working for the moment. If anyone has an idea on how to properly handle this on Synology, please feel free to share.
I don’t think it was an error caused by the update, rather, I accidentally broke it myself while adjusting the permissions at the top-level folder level without realizing it.
BR