PS 2.9.1 Multiple Build plates feature only support 9 plates

[5jvm0u4]

Description of the bug

The new feature of multiple build plate stop working after 9 plates are present.

Project file & How to reproduce

Open a big enough project and arrange objects.

Startturm-Gray.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.9.1

Operating system

24H2

Printer model

Original Prusa i3 MK4S