Also, concidering rest of the game ... i have no idea how that feels in DnD system, but i presume that death is something quite unpleasant.

Exactly! That IS the point, why you should be agressive toward this suggestion.
On the contrary ...
That is why you cannot get the suggestion at all.
Once you know its just temporary death > worm knows.

The only way i can imagine this could work, would be if someone kills your whole party ... and then, without any reason or warning ... someone entirely else, who you probably never seen before, just came and ressurect you all.

they would know that your death was not permanent and therefore they would keep resisting extraction ...
3rd position on my list, the parasite left brain of the owner - the peasant who seeks Spear of the Absolute. And his brain wasn't smashed, you can even talk to him through "Speak with the dead" spell. We had body in one hand and parasite under other foot. Separated. Theoretically (in D&D terms) we could spent 1000 gp and resurrect him, the resurrection spell can be used to the body, which was dead no longer then 100 years (By the way - the skeleton gives us generous prices). So the tadpole just can't know, how long it would take AND Halsin already successfully extracted one from dead body. So I see no obstacles.
Yes, we have seen examples of parasite leaving brain of its victims ...
As far as i know, so far there is one for Dwarf, reportely one for Gnoll leader and all Goblin leaders (i must have missed that, i never seen their tadpoles

), and there is datamined scene of fight between two of your companions, that also leads to stomping one of their tadpole ...
But in all examples, there is nobody to ressurect the person.
Their death seem permanent in all way (and permanent it is, just bcs you are *technically* unable to use revivify scroll to anyone except your party).
Our characters died multiple times in our adventure ... especialy if we are not carefull.

And tadpole never leaved them ... well, we might ofcourse see that as plothole, but personaly i prefer to remember the fact that our tadpoles tie our minds together, so they *know* we are going to ressurect them eventualy.