Suddenly issue with MasVideos "Creation of dynamic property"

This occured since a few days:

Deprecated: Creation of dynamic property MasVideos::$structured_data is deprecated in /www/htdocs/safemike/metalunites/wp-content/plugins/masvideos/includes/class-masvideos.php on line 355

What ay cause it?
I found some source telling me, that PHP 8.2 must be updated to 8.3.
I did, but still the error is shown.