Smart mailboxes disappear and/or change back to previous configs

Hi,

I have a few flag color nased smart mailbox configured and I am trying to edit some of them and to create a few new ones. I do succeed both editing the existing ones and creating new ones. But after a while, when I’m actually flagging messages in the inbox, all of a sudden I realize the new smart mailboxes disappered and the edited ones are back at their previous configurations. And these are very simple configurartions. I just want different smart mailboxes to get messages from the different colored flags, and I also give a name to each mailbox. Nothing complicated.

Why is this happening and how can I fix this?

I’m running Mail version 14 on MacOS 11.6.4 on a Macbook with 8 gb RAM

Thanks