[BUG] Inductive probe and G28 X Y causes Z to move to absolute Z5.01 first

[mlewis-everley]

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Bug Description

I am not sure if this is a bug, or if I have mucked something up in my config, I have installed an inductive probe on my i3 Mega's and they are working perfectly except that now when you issue G28 X Y or G28 X or G28 Y, the Z axis moves to absolute 5.01 prior to homing the X &/or Y.

I cannot see anything obvious in this fork that would cause this behavior. I have added similar features to vanilla marlin for a different printer and am not getting this issue so possibly this is a bug?

Happy to submit a PR for this issue, but at the moment I am stumped as to what might be causing it. I have not used the BLTouch version of this firmware, so not sure if that behaves the same way?

My fork is: https://github.com/mlewis-everley/Marlin-2-0-x-Anycubic-i3-MEGA-S

Steps to Reproduce

1. Install custom probe.
2. Compile and install this firmware.
3. Move the Z up (EG: G1 Z100).
4. Turn off steppers.
5. Home XY G28 X Y.
6. Z will now move to Z5.01 BEFORE homing X and Y.

[knutwurst]

That's strange... but I'll take al look :)

[mlewis-everley]

Thank you, I have done a little bit more testing my end. It appears this only happens after you run a G29.

Prior to this, homing works as expected, if I run G28 X or G28 Y then the print head moves up 10mm and then performs a home.

After running G29, the above issues then occur.