Using DX VX.2.1
The attached hetero part definition is used to place 4 schematic symbols comprising one real part. The 2nd symbol in the series does not display any pin numbers in the schematic. The layout shows the pins are correctly and completely assigned.
I found an older post that described a similar issue as a result of whitespace in the part definition. I do not see leading, trailing, or interstitial spaces in the pin assignments, the file name, or any of the property fields. Photo attached. Notice the properties dialog capture was taken with all four parts highlighted. They are identical except for the ID.