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This PR addresses Marlin issue MarlinFirmware#24758 which improves Marlin pull request MarlinFirmware#24553. It has some other commits in it since I started at the current bugfix2.1.x
If using MECHANICAL_SWITCHING extruder/nozzle, set HOTEND_OFFSET in Z axis after running EVENT_GCODE_TOOLCHANGE so that nozzle does not lower below print surface if new hotend Z offset is higher than old hotend Z offset.