I have Pokeheroes open in multiple tabs at almost all times, and I
had one page open to the Collect Egg selection of my event pass.
Every time I refresh that page after I've selected the collect egg
button (or whatever the text actually says), it will give me a new
egg. This is working as it's supposed to. But I just hatched a
shiny, which is supposed to make me unable to claim any new eggs
and take any eggs away that were added via the event pass, and the
page hadn't updated since I had hatched it. I refreshed my page,
hoping it would tell me that there was an error or that the top bar
that said it couldn't collect an egg (it had refreshed itself when
my party was full before) would disappear. Instead, it said a new
egg was added to my party and then I actually got a new egg.
If you already obtained a shiny from your event pass then probably
the new ones you are taking are being bought with your event
points.
In other words, they are not "free" ones like the ones obtained
with an active pass, you are paying for them
Then that's still a bug because those are entirely different
buttons to begin with. You can still access the button to buy an
egg on the page where you collect an egg from the event pass after
all.
Just remember: You can't prove God didn't crawl out of the ocean.