Please remove a portal from a mission if it's moved more than 150 meters
Sometimes a portal is moved quite a long distance: a statue is relocated, an iconic business moves, etc.
If the relocated portal is part of a mission, it can significantly change the character of the mission. It's no fun to start a highly-rated mission with a 7 minute average duration and discover that the last portal is 3 km away. It's even more frustrating to have a 4 km walk added in the middle of a banner. And it's downright embarrassing to be the author and field complaints over a problem you had no way to know about beforehand.
Mission 11 of https://bannergress.com/banner/frogden-farm-6167 includes a portal for Heebeegeebeez Comix & Games which has moved 1.4 km away. This was a problem in February 2020 and still has not been fixed by the mission author. (To be fair a lot of people haven't played much Ingress since then...)
My mission "Portal party: Cherry Orchard" includes a portal for the historic CJ Olson fruit stand which I had thought was removed when the building was converted to a coffee shop. Nope, the portal was moved to the Senior Center in the Sunnyvale Community Center complex a mile away. (As a side note, I just don't understand the logic behind that move at all. Is it supposed to be the site of the temporary seasonal tent where they sell apricots? The historic building still stands in its original location...)
The store "Capital Games" moved, taking its portal with it, adding a long dog-leg to https://intel.ingress.com/mission/111ec4c6d1ae46bdb2ccfbd7a4fb1f45.1c -- and because it's the last portal of the mission, there's no easy way to find the next mission of the banner in mission-dense downtown Sacramento., (@aznpandafood is a fix coming?)
These are not isolated examples -- it's happened in Chicago, in Albuquerque, and elsewhere.