Confirmed via parse as well as checking the tooltip
When using Targeting-Linked Terran Disruptor Dual Heavy Cannons and activating the Boff ability "Rapid Fire 3," those cannons only get the Rapid Fire 1 buff. Other non-terran cannons on the ship get the correct Rapid Fire 3 buff.
Proof from parse - this ship had 2x Targeting Linked DHC, 1x Wide Arc DHC, 1x Terran Task Force DHC, and 1x Piezo Polaron DC
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