An update: versions 4.0.6 and 4.1.5 were released a few days ago.
4.1.5 does contain this fix, so that's the good news. If 4.1.5 makes buster (which I'm assuming it would), the fix would automatically be in buster and later versions of Debian.
Unfortunately the fix seems to NOT have been included in 4.0.6. I don't know why that is the case. I'm guessing that means it won't make sense to apply the patch to the Debian version in stretch. For what it's worth, I've been running such a patched version with no trouble since February, and I suppose I'll just keep doing that until buster.
Thanks for your work on PowerDNS in Debian!
