Nightly - No Sparse Layers & Sequential Output broken

What happened?

I'm currently using the Nightly 2.4.58.3 due to the improved Aligned Seam generation but for everything that is either Multi Material/Color or Sequential 3D Printing I have to go back to using an older Version as there seems to be something funny going on with the Z-Height...

On Multi Material/Color Prints it's already obvious while just looking at the generated Preview ( Ctrl+3 ) where the Layers of the Wipe Tower are floating in midair at a height where the purge would be happening without No Sparse Layer active ( this has always been the case with the final Purge? Move at the end of a Print ) but there also appears to be an issue with Sequential Printing where the following prints after the first one start at like 2-3 layers above the Print Bed obviously not sticking to the Bed.

Picture of the No Sparse Layer problem:

On a somewhat possibly related question... The Version of this Bug Report lists 2.4.60.2 as a possible Version - Where can one download that one? The 2.4.58.3 I'm using was linked to me a while ago in a different thread but the highest I can actually find on the site under TAGS is 2.4.58.2 🤔

Project file & How to reproduce

Create an Object on the Build Platform ( or import a model )
Crate a Toolchange Modifier ( for MMU use setup Printer Profile possibly required? ) to a different color midway into the Print
Under Print Settings > Multiple Extruders > Wipe Tower checkmark both:
- Enable ( Wipe Tower )
- No sparse layers (EXPERIMENTAL)
Slice (Ctrl+R)
Purge Tower Color Changes will float in midair.

Version

2.4.58.3

Operating system

Windows 11

Printer model

Voron 2.4 with StealthBurner & ERCF

supermerill / SuperSlicer