[5.9.0-beta.1] Coasting causes moves to Z=0

[Hello1024]

Application Version
5.9.0-beta.1

Platform
Linux

Steps to Reproduce
Open attached .3mf, slice, and inspect gcode in 3rd party viewer.

Actual Results
Gcode file contains "Z0.00" hundreds of times all throughout the print. This causes the head to crash into the print and the bed. This isn't visible in the built in viewer, but shows in 3rd party viewers and on the printer itself.

Expected results
Should not go down to Z=0 ever.

Additional Information
If you turn off coasting, this problem goes away. Seems this problem is something todo with the wipe move, but setting the wipe move to 0.0mm doesn't seem to help.

sphere_r-24mm.zip