Sorry to revive this topic.
I have contacted MikroTik on this issue and after some “haggling” with their support, I have finally received a clear info on the fix status:
So there we have it ladies and gents,
The fix was introduced in V7.1beta3 and didn’t effect any stable builds. The first stable build was 7.1 and it had the fix in it. So the answer to your questin is - no! No V7 stable branches where affected.
If any Greenbone staff want to verify this support exchange, feel free to DM me, as I am not comfortable sharing my full name here.
EDIT: MikroTik staff have also replied publically on this issue, albeit a lot less detailed.