Hi, this bug is still happening. I've tried to go into TMQ3 and done the following things to get rid of it.
Waking up the dragon while having the previous egg equipped will trigger the chase and allow you to place the egg on the raised land. However when you are running towards the stump the character will constantly say something like "i found the egg but the equipment slot isn't empty" Then when you place the egg down the cutscene will play and automatically place the new egg on your back. Not fixing the problem at all.
I've also tried letting the mobs in the quest kill me while i have the egg on to see if it removes TMQ3 specific items. That doesn't work
And i've also tried to let the dinosaur kill me while it chases me to collect the egg. That doesn't remove it either.
We've already tried the un-equip it and discard, placing it in the inventory rubbish bin, and i even tried the quest menu "J" rubbish bin. All don't work and place the egg back in your regular inventory too.
I hate doing this because it must e annoying. But one of the moderators closed this topic and i had to ask one on discord to re-open it. That means it was either fixed and a mod closed it or it was wrongfully closed by mistake. If it has been fixed could said moderator post here saying how it is fixed or bring up a few suggestions? Aru GokUsama Celestial Titania Box-head(boxbox) Tempest Hardlock Shii (sorry if i missed a few)
Update: I've been through TMQ3 with some mods and we tested it. I also have a previous recording of the egg bug. Here's the YouTube link:
TMQ3 Bugs