Auto-share of ETA on Apple Maps is not working for just my home destination

Okay, so here's a weird one.

In Apple Maps on my iPhone 14, if I go into the Favourites and choose my Home address (from my contact card), and select "Share ETA" and Add Person, whomever I add to that list, once I tap Done, they are removed.

So, in effect, I can't auto-share my ETA on Apple Maps just to my home address. If I try my Work address or any other favourite, it works fine.

I have tried this on a couple of my family iPhones and it seems to work for them. I have tried uninstalling Apple Maps and reinstalling. I have tried deleting my contact card and adding a new one.

Is there some other trick I can use to 'reset' Apple Maps or my contacts so that I can auto-share my ETA when travelling home?