Problem with attachment thumbnails after upgrade

[CNK]

Hello, I upgraded my XenForo and php, but unfortunatelly I have problem with images thumbnails:






All images are attached like files without thumbnail.

I have php7.0 and imagick 3.4.3: https://forum.gsmx.pl/t.php

I noticed, that on php5 and "PHP built-in GD image library" it works great..
So probably the issue is with imagick and php7.