The ballroom doesn't work in the mansion. if you choose Cedar Town, it works. But if you select Lakeview, it starts the Cedar Town party. Choosing the Fae Village does nothing.
Elf Kingdom quests can't be completed. After ingesting Fertite and making seeds with it, talking to the queen does nothing. Giving fertite to the tree mother sends her to the mansion garden, but that quest is also not completed. This also means that the girl who gives you the quest is stuck in "I hope she's ok" dialogue. Talking to the elf in the town that you give a bunch of seeds to and make grow bigger, stalls after a bit, and you can't get her to the mansion.
You can't talk to Rose after she grows on the red dragon throne. She shows up in the mansion, back to normal. You can feed her a seed, and sometimes when you come back she will be stage 1 pregnant. But coming back later and sometimes she'll be back to normal. Might not be a bug, but odd nonetheless. Morgana also can't be talked to while in the mansion.
You can recruit the bunny girl from the casino to the mansion, but after the introduction, she never shows up there (I have every area unlocked).
Two commissions can't be started from the adventurer's guild thingy. Rumored Wishes, that says talk to a man in a turban in the room. You can't interact with him. Harpy Hunt, says talk to the soldier in the room. But he doesn't start a quest at all.