Importing an Object (now Class) Types Editor file that worked fine in 1.8.6 only imports the names in 1.9, none of the custom properties themselves appear to be importing correctly?
I just tried it and it’s working fine for me. Could you open an issue at https://github.com/mapeditor/tiled/issues and attach the file that is not importing correctly?
Agh, forgot about this, sorry. Issue opened now.