Status
Works as designed
Issue description
For those that are not familiar with the name, "pieces" refers to grouping multiple parts in techne so that they all move the same. I think it works fine with tabula. Importing any model with pieces generates many errors. I don't know javascript but by comparison I am pretty sure MCreator just doesnt import/read the file correctly.
MCreator model import works, it is just that Techne doesn't export it properly. We are dropping the support of Techne in the favor of new modeler. Check this issue for more details: https://mcreator.net/tracker/issue/40561