Mobs that were not linked before are now invisibly linked

[Hinalover]

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Date & Time: 10/22/2017 2:15pm EST
Frequency: All the Time
World name: Behimoth
Character name: Delritha
Monster name: Gastornis, Gaelicat,
Class/Level: Bard & Red Mage / level 70 each
Party or solo: Solo
In-game time: 10:00 am
Area and coordinates: The Sea of Clouds

Steps:
1. Target a mob in close proximity to another mob but is not showing any links
2. Attack mob and both mobs are pulled

Something changed in 4.1; or when a player is level 70; with regard to how mobs are aggro-ed in Heavensward content. Before (including all of Heavensward), if a mob is not linked to a nearby mob, just the one mob is pulled. Now, that same mob pulls any nearby mobs. For example there is a Gaelicat (in The Sea of Clouds at x12.0 y33.4 z0.8) who is next a Gastornis. All through Heavensward if the Gaelicat was up for the daily hunt, I could just pull the Gaelicat and not worry about the Gastornis since it would not get pulled. Now I pull the same mob, and the Gatornis is pulled as well. Same with any other similar mobs in the zone.