Getting Error Notice: Function _load_textdomain_

Since WP 6.8 you get the following message in Debug Mode and Error Log:

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the age-gate domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in wp-includes/functions.php on line 6121

This happend to plenty of plugins since WP 6.7. and several have already fixed this.

Would be great if somebody could take a look at it! Thx!