will failLY-03^LL · offset 0 · label 1
This ^LL comes after the first field, where it is documented as having no effect. The label length you intended is not applied.
Put ^LL immediately after ^XA.
will failLY-03layout
^LL is ignored and the label length is wrong
This ^LL comes after the first field, where it is documented as having no effect. The label length you intended is not applied.
Put ^LL immediately after ^XA.
A label that trips it
^XA^FO50,50^FDX^FS^LL1218^XZ
What the check looks for
^LL appearing after the first ^FS in the format.
What Labelproof says about it