This is not a bug. There are two issues here:
The link you're trying is not a direct link to the file. It's a server-generated thumbnail. Have a closer look at the path of the link. You will notice it shows the file name twice.
The file size is 2.18 MB, larger than the max upload limit of 2MB.
In this case, the link that should work is:
https://upload.wikimedia.org/wikipedia/commons/7/7a/Gehling_PLZ106AR_Kruk_OTT_2013_D7N9017_009.jpg However, it still won't work because the source file is too large.
Normally, on wikicommons, you will find a link for direct file links that will work here:
It will provide you everything you need to share the image with proper credits:
The link you need to upload the image is the File URL, but again, in this case the you will need to reduce its file size first.