In 8.3.1, "Fixed Eggs' underlying species being revealed by PC searching.". While quite insignificant, I understand the reasoning behind this change.

However, eggs now don't show up in the PC Search at all, not even when searching for "Egg".
By the wording on the patch notes, I assume this is a bug, since it seems the intention was to not be able to tell what an egg was (I'm assuming focused on DittoxDitto), rather than not being able to find the egg at all.
Regardless, this is a major QoL downgrade for players who breed.

Thank you for the report!
I am able to confirm this as a bug and have forwarded the ticket to our internal tracker.

this is not a bug
https://imgur.com/a/dOgIJBY

The way this is coded, you can't search for a Pokemon named "eggs". The hardcoded keyword overwrites the search.

Furthermore, when a pokemon is named [eggs*], (e.g. eggsabc), searching for the extended word ("eggsa", "eggsab", "eggsabc") makes the Pokemon appear in the search screen momentarily, and then hides it.

I understand now that both egg and eggs need to be searched I'm sorry!

It's not so much about the keywords, but rather the implementation. Ideally, you want an Egg to be included in the search system with the nickname "Egg" and the species "Egg". That way, it shows up when searching for "e", "eg", "egg", (alongside other Pokémon that fit those criteria"), but not when searching for the underlying species.

I understand there might be limitations (species being an enum, implementation of eggs) which lead to the keyword search, I'm just mentioning this in case there was a misunderstanding of the intended feature, either from the Dev's or my side.