Consistent Probe XY offset type

Marlin/src/gcode/calibrate/G76_M192_M871.cpp

@@ -144,7 +144,7 @@ void GcodeSuite::G76() {
 
   const xyz_pos_t parkpos = temp_comp.park_point,
             probe_pos_xyz = xyz_pos_t(temp_comp.measure_point) + xyz_pos_t({ 0.0f, 0.0f, PTC_PROBE_HEATING_OFFSET }),
-              noz_pos_xyz = probe_pos_xyz - xy_pos_t(probe.offset_xy); // Nozzle position based on probe position
+              noz_pos_xyz = probe_pos_xyz - probe.offset_xy;  // Nozzle position based on probe position
 
   if (do_bed_cal || do_probe_cal) {
     // Ensure park position is reachable

Marlin/src/module/probe.cpp

@@ -89,7 +89,7 @@ Probe probe;
 xyz_pos_t Probe::offset; // Initialized by settings.load()
 
 #if HAS_PROBE_XY_OFFSET
-  const xyz_pos_t &Probe::offset_xy = Probe::offset;
+  const xy_pos_t &Probe::offset_xy = xy_pos_t(Probe::offset);
 #endif
 
 #if ENABLED(Z_PROBE_SLED)

Marlin/src/module/probe.h

@@ -122,7 +122,7 @@ public:
   // Use offset_xy for read only access
   // More optimal the XY offset is known to always be zero.
   #if HAS_PROBE_XY_OFFSET
-    static const xyz_pos_t &offset_xy;
+    static const xy_pos_t &offset_xy;
   #else
     static constexpr xy_pos_t offset_xy = xy_pos_t({ 0, 0 });   // See #16767
   #endif