GTM Configuration for Session Replay: Masking Issue Explained

Hi, this is my GTM tag configuration to enable session replay. The recording is working correctly, and I can see the "Session Recording Checkpoint" event on the platform. I've overridden the default values for the init options (record_block_selector, record_mask_text_class, record_mask_text_selector) so that page elements are not masked with asterisks, in order to test and see the differences. I left the values empty so that empty strings would be inserted by default, but the recordings on the Mixpanel platform still show content masked with asterisks. Why is that? Thank you!