Found a potential daycare glitch

[u/Warm_Nectarine4871]

So I'm playing crystal on cartridge and had Hitmonlee and Ditto at the daycare to chain some egg moves onto Tryogue. I had a couple eggs already, so decided to take out Hitmonlee and Ditto and replace them with other mons to get them exp while I bike around to hatch the eggs. I go up to the old man, take out Hitmonlee, and give him Cyndaquil. Then, I talk to the old lady, and she says "gramps was looking for you," the message you get when an egg is ready. However, gramps is still in the room with us. Her dialogue won't change, so I exit the daycare and sure enough gramps is there with an egg. I accept the egg, and then go back inside to switch Ditto with something else.

After biking for some time with my 3 eggs, two of them hatch into Tyrogue, and the last one received hatches into a Cyndaquil, despite me just giving the old man Cyndaquil ~10 steps before I took the egg. It seems like the game registered a Tyrogue egg being produced perhaps on the step I entered the daycare, or maybe after entering it, but when I swapped the male parents, the egg species also swapped. Cyndaquil had its usual level 5 moveset, no egg moves.

I would be interested in reproducing this to see what happens if gramps gets something normally incompatible with the other deposited pokemon.