I just noticed that the patch was marked as Related not Resolves for the bug. Moving back to ON_DEV and asking the owner to comment.
It was a mistake. It completely resolves this bug, so it should have been "Resolves" and "not Related".
The fix wee provided with openstack-neutron-10.0.0-13.el7ost is causing some other issue, so we will revert it and provide alternate fix u/s https://review.openstack.org/#/c/454832/ Please see below comments
Verified on openstack-neutron-10.0.1-1.el7ost.noarch
Deleting subnet with 3 ports succeeds
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.