So there are good news, but we are not there yet.
I have managed to get the server running now, but there are still inconsistencies in the item names from 1.12 to 1.13. So shop and deposit as well as voting is off now.
I have figure out how to fix these (except voting, there seem to be additional complexities), I still need to do so however.
Once that is done, we can enable shop & deposit, but I have seen other errors of currently unknown source that I need to identify and fix as well.
The whole thing might be a bit complicated and last for a couple of days until all is back to normal. I would recommend everyone to just stick to the temp server right now as the main server will have frequent reboots without warnings for the time being. The remaining bugs might further affect game consistency.