Upload of Asset works 50% (uploaded but not visible)

Hi, I have a Pimcore 4.6 (latest in 4 branch). I have 2 installs both with the same problem: Uploading of assets fails. Actually the asset is successfully uploaded to the server, but no database entry is made. The request to the server gives an empty response, but no error message nor entry in the log files.

Any idea/help where I can look?

Found it: Imagick was not available! But pimcore doesn’t complain about it, and it also doesn’t generate any debug messages nor errors…