Originally shared by Ingress
A change to Portal linkability inside existing Fields has been discovered.
If a Portal is inside an existing Field, it is no longer possible to establish a Link to that Portal. Agents should still be able to create or stack Fields over existing Fields.
Multiple parties have revealed their capability to introduce modifications to the Scanner, as most recently witnessed by IQTech Research's Regional Tracking Technology, or Regional Scores. The source of this most recent change has not yet been identified.