Umbreon evolution invalid

[Munchin2000]

My Umbreon appears as illegal, when I click on the error icon the program tells me that the evolution is not valid but that doesn't seem to make any sense. If I change it to any other eeveelution, including Espeon and Sylveon, then it's legal. What could be the reasoning behind this? (Note that I caught this legitimately in Go). I've attached the file.

197 ★ - Tamao - 9349D248177E.pa8

[Kaphotics]

It's fine, just an error in PKHeX's checking logic. Will be fixed in future updates.