Moving Apple ID Family to another country

Hello,

I've my Apple ID has USA as the country, and so do the accounts of my children who are both under 13 and attached to my account as child accounts.

I need to change my account's country. I've read that the procedure for children under 13 is to move them to a new "family", update the country on my primary Apple ID, then move them back.

However, I've read in this thread:

Transferred child to another family shari… - Apple Community

that the child account countries do not update and therefore cannot share any purchases or anything like that.

Has this issue been resolved? Was that just a one-off thing?

I have a second account in the target country, but I can't simply migrate to that account because I don't want to lose the 650+ gigabytes of photos I have in iCloud. I could use that account to create a new temporary family for my children's accounts, but if their countries don't update, then it doesn't make any sense to even try, does it?