Why does the -01 gets removed from the GC serial numbers?

Which games? Star fox? In this there were no -01 when I added it.

My patch requests thread
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Maybe the parser removes it.

What I have seen was that most Player's Choice Editions had a -01 appended to the serial.
Star Fox Adventures is one example, Mario Party 4 is another: Serial: DL-DOL-GMPP-EUR-01

Maybe it is not important and it only means that this disc belonged to a 'Player's Choice' edition.
But this would also mean that my NFS Underground (G) is from a normal copy in a Player's Choice DVD case.

...-01 is not impotent, that means indeed that the disc is from 'Player's Choice' edition.

when your NFS Underground (G) disc has ...-01 on it, then his edition should be fixed.

PX-760A (+30), PX-W4824TA (+98), GSA-H42L (+667), GDR-8164B (+102), SH-D162D (+6), SOHD-167T (+12)

The disc is without the -01, so it's a normal edition an not player's choice :x