For some history, I think
flygod's issue relates to when they were introducing fee free changes back in March for part flow itineraries and whether they should have been charged the fee online. See the links below for previous posts.
Looking for time and date of March travel trade advisory
https://www.flyertalk.com/forum/32184869-post915.html
I think it does largely depend on the timing of the change compared to the timing of the update in policy.