@treb0r, I have upgraded to the latest versions of App and Firmware and can now replicate your first attachment error.
I can see here that the urlDecode() line has now been commented out of Firmware but not out of App. So you get the behavior you are seeing above (i.e. the %2C sequence is not being decoded back to a “,” delimiter). Looks like it was a conscious decision to remove the decoding but I’m not sure why. You have the option to edit stns.dat directly but, as you say, be wary of updating/saving.
Linking in github issue 70 that is tracking this.