v10: Custom unencrypted column now appears as encrypted in Manager

Hi,

We have a custom unencrypted column in Person , we've been working with it for ages. In contains the ID of a person in Spain: Eight numbers and a letter.

After migrating from 9.2 to 10, this column appears in Designer as unencrypted , you can see its values in Object Browser too.

Manager, however, shows the column as encrypted, its values are hidden and there's an option to enter its value and repeat it , as if it was a password.

Could it be that Manager, due to its value, is automatically detecting the column as such?  How can I revert this?

Thanks!