This is a bug most probably introduced with the update to Spring '24 and affects also the creation of scratch orgs.
Salesforce has just identified it as a multi-customer concern and confirmed it as bug. It can be found here:
https://issues.salesforce.com/issue/a028c00000yx0wjAAA/
I've also opened a bug in sfdx cli github project in case this wasn't recognized by Salesforce (I think it will be soon closed):.