Yeah I also noticed that. Just changed that and lived happily on since then:
#Bus pirate v5
SUBSYSTEM=="tty", ATTRS{idVendor}=="1209", ATTRS{idProduct}=="7331", ATTRS{serial}=="32420B0B33CC62E4", ENV{ID_USB_INTERFACE_NUM}=="00", TAG+="uaccess", SYMLINK+="buspirate-text", ENV{ID_SIGROK}+="1"
SUBSYSTEM=="tty", ATTRS{idVendor}=="1209", ATTRS{idProduct}=="7331", ATTRS{serial}=="32420B0B33CC62E4", ENV{ID_USB_INTERFACE_NUM}=="02", TAG+="uaccess", SYMLINK+="buspirate-binary", ENV{ID_SIGROK}+="1"
This are mine now