This field runs past the right edge of the printable area. ZPL clips it — it never wraps and never scales.
Move the field left, shorten the content, or raise ^PW if the printhead allows it.
^XA^PW406^FO300,50^A0N,50,50^FDLONG TEXT HERE^FS^XZ
A field's computed extent passes the effective print width.
Checked against 43 rules at 203 dpi.
This example does not currently trip LY-01 under the default 203 dpi GS1 profile. That is worth knowing rather than hiding — see the open items in the repository.