Extruders priming is done in the middle of the print bed

[fjpanag]

Version

Version 2.3.0+linux-x64-GTK3

Operating system type + version

Fedora 33

3D printer brand / version + firmware version (if known)

Custom delta, based on Duet3D.

Behavior

My printer has two printheads, and I want to use them for color prints.

When I select "Prime all printing extruders", for some reason the priming area is misplaced.
It tries to prime them in the middle of the print bed, which is wrong:

(Notice the priming bellow the frog)

Is this a new feature request?
No, it a bug report.

Project File (.3MF) where problem occurs

The project file.
(Zipped to allow for uploading...)
2color_treefrog_small_hollow.zip

[lukasmatena]

I tried to improve the placement a bit with 95f5b82. Closing.