to have so far gone + past participle

Question

Although cows are famed for their ability to forecast rain hours advance, their talent for navigating has so far gone overlooked.

1. Is that an idiomatic grammar construction or simply Present Perfect + past participle?
2. It's not clear for me what sense the word "gone" makes.

Answer 1

To go overlooked means that something or someone remains unnoticed, especially when there is something noteworthy about them. Thus,

They have gone overlooked.

Nobody has noticed them.

so far means "up until now".

Up until now, nobody has seen them and recognized that talent.

... their talent ... has, so far, gone overlooked ...