Messages in iCloud not deleting old messages

Hi,

Can you explain me why iCloud doesn’t delete old messages ?

I turn on delete messages after 30 days on my iPhone, it works. Messages older than 30 days are automatically deleted.

I turn on this also on iCloud. It says : Be careful, messages older than 30 days will be deleted but nothing. Old messages stay on iCloud. I record over 12000 messages.

How to clear this 12000 messages without disabling iCloud sync for 30 days.

Why iCloud doesn’t delete old messages from it storage ?

[Re-Titled by Moderator]