Build fails at 49% with deprecated=no

[LaccademiaDeveloper]

Tested versions

-v4.6.dev.custom_build [b15a13e]

System information

Linux Mint 22.2. HP laptop with Ryzen 5 5625U and integrated graphics.

Issue description

Editor build fails at 49% with this error:

[ 49%] Compiling editor/settings/editor_autoload_settings.cpp ...
editor/project_upgrade/project_upgrade_tool.cpp:110:18: error: no member named 'upgrading_skeleton_compat' in 'MeshInstance3D'
110 | MeshInstance3D::upgrading_skeleton_compat = true;
| ~~~~~~~~~~~~~~~~^
editor/project_upgrade/project_upgrade_tool.cpp:124:18: error: no member named 'upgrading_skeleton_compat' in 'MeshInstance3D'
124 | MeshInstance3D::upgrading_skeleton_compat = false;
| ~~~~~~~~~~~~~~~~^
2 errors generated.
scons: *** [bin/obj/editor/project_upgrade/project_upgrade_tool.linuxbsd.editor.x86_64.llvm.o] Error 1
scons: building terminated because of errors.
INFO: Time elapsed: 00:05:07.36

issue introduced in #112607

Steps to reproduce

Build godot editor from the latest main with deprecated=no

Minimal reproduction project (MRP)

There's no project since is an error generated building the engine.