A barcode can extend past its origin
A barcode starting at y=560 with height 150 does not fit inside a 609-dot label. Check the field footprint, not only the ^FO origin.
^XA
^PW812
^LL609
^FO50,560^BY3
^BCN,150,Y,N,N
^FD1Z999AA10123456784^FS
^XZZPL ^LL Label Length Command
^LL defines label length in dots. It is the first command to check when the bottom barcode or footer text disappears.
^LLHeightClipping
Check label length