Possible bug: CHS/CHT egg names using species name

[theSLAYER]

Was helping a fellow user with a trade, from my CHS game save.
When trading, I noticed the event eggs weren't named Eggs, but rather, had the species name.

The eggs were generated using PKHeX, by dragging the Wonder card into the PC slot.

As seen in the example above, the Egg is named Mareanie.
[The UI is in English because I swapped out the text files, but fact of the matter is oddly, the egg is using the Species name]

I titled this Possible bug because I don't think other languages have this issue,
and I didn't make any other alterations, so it's likely that this is a pkhex bug.

[wwwwwwzx]

it should be a pkhex bug and I can help fix it.

But I'm not sure if the nickname should be flagged.

[Sonic Blader]

I can confirm that the same happens with ENG tagged ones. The eggs are nicknamed with their species name.