Hi, until the issue is fixed, here is a workaround:
- At the start of your project,
Set [Z] rotation to  and
Set [Y] rotation to [-90]
- Make sure that you're not using any absolute coordinates (as in
Change absolute [X/Y/Z] by )
Et voilà, there is no step 3
That worked for me at least, my STLs are now perfectly placed when I load them into the slicer.