'Fill Plate' doesn't respect z sink setting

[easycheese]

Description of the bug

When using the 'Fill plate with instances', any stl that has a modified z height is reset to the original value

Project file & How to reproduce

egg.zip

1. Open the attached file.
2. Note that there is a specific z height set on the model.
3. Right click and 'Fill plate with instances'
4. Note that each object is now reset to build plate height (would cause a failure upon print ('did' lol))

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.5 & 2.6 alpha 5

Operating system

Windows 10

Printer model

Prusa mk3s+