Did you test the latest bugfix-2.0.x code?

Yes, and the problem still exists.

Bug Description

Multiple Compiler errors similar to:
Marlin/src/module/endstops.cpp: In static member function 'static void Endstops::update()':
Marlin/src/module/endstops.cpp:623:25: error: 'X_HEAD' was not declared in this scope
#define X_AXIS_HEAD X_HEAD

Bug Timeline

Today.

Expected behavior

No response

Actual behavior

No response

Steps to Reproduce

1. Set Machine type to MarkForged_XY
2. Set axis to 3
3. Complie

Version of Marlin Firmware

2.0.9

Printer model

No response

Electronics

MKS Gen-L

Add-ons

No response

Your Slicer

No response

Host Software

No response

Additional information & file uploads

Editing line 86 of types.h seems to fix the issue (not tested on a real machine yet!).
config.zip

Change:
#if IS_CORE
to:
#if EITHER(IS_CORE, MARKFORGED_XY)