A few days later and I found that bplaced is goind to end PHP 5.6 support some time mid year.
https://inside.bplaced.net/php-8-3-verf ... g-php-5-6/
To no break, both my ancient Wordpress site and the BOTF-Wiki will have to be upgraded. They both still run with PHP5.6.
Not sure what issues I'll face and whether it is worth to upgrade, but will have to give it a try I guess...
Well, after I finished UE release ofc.