Findrek

it finally worked! thanks a lot!
after that i ran into a couple more issues where it didn't detect the banner pattern textures or pattern list, for anyone else running into this problem i copied too the lines where they're mentioned in the 1.14 midata to the 1.13 one removing the last pattern of the globe.
now just hoping for a future mine-imator version or at least a patch it can convert earlier versions automatically without this much trouble.

I think I know what’s happening- It allows compatibility between Minecraft versions but the midata has to be written in the latest format, probably to avoid corruption. You can go into 1.13.1.midata and change the format number to 5, but I would probably recommend backing up your projects first. Once you change the format to 5 change to the version like normal and restart like normal and it should work.