Well, the thing is: We can’t upgrade to 4.12, yet, so I need to find the exact git commit of this fix to manually merge it into our code base. I already spent a few hours trying to work my way through all the git commits of the last few months but couldn’t find any relevant changes. As I don’t know what classes are involved exactly, finding the fixing commit is nearly impossible. So I would really like to get some details about this issue and hopefully the exact git commit 
Edit: We are on 4.11.2 right now and will not update to 4.12 for at least a few months.