More are less in relation with MC-116969
That seems to be well fixed for separated mobs being not passengers.

But mobs still look at passengers mobs being invisible, even if they are silent and have no AI.

How to reproduce ?

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Best example are villagers since they look at each other very quickly:

/summon minecraft:villager ~ ~ ~ {Passengers:[{id:"minecraft:villager",Silent:1b,NoAI:1b,active_effects:[{duration:-1,amplifier:0b,id:"minecraft:invisibility"}]}]}

Result in the screenshot "bug_report_0": the villager looks at its own invisible passenger.

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You can also summon another mob having an invisible villager passenger, and another villager next to it. This last villager will look at the invisible villager riding the entity.

/summon minecraft:cow ~ ~ ~ {Passengers:[{id:"minecraft:villager",Silent:1b,NoAI:1b,active_effects:[{duration:-1,amplifier:0b,id:"minecraft:invisibility"}]}]}

/summon minecraft:villager ~-1 ~ ~

Result in the screenshot "bug_report_1": the villager looks at the invisible passenger even if it rides another mob.