Gen 3 pokemon get marked as egg encounter when made shiny on pkhex

[DiegoA111234]

I am currently on a platinum save, I migrated pokemon from leafgreen and emerald and when i try to make them shiny they are flagged as legal, but the encounter type gets changed from wild to egg, is this behavior intended? does pkhex do this in an attempt to make a valid shiny PID? is there a way the mon to keep their encounter type and be shiny?

[Kaphotics]

By modifying the PID to be shiny, it no longer has a PID type of Method 4, because you didn't change the IVs after.

The program recognizes it as a valid egg, because it is valid if it is assumed to have originated from an egg.