You'll meet Nightingale when you first get to Zalesye, and he'll offer a bet: who can destroy more blind dogs. This will lead to a small side mission called "Nightingale's Hunt", in which you'll need to complete the following tasks:
The pack of blind dogs and the mutant near the old mill are easy to find, but there are problems with finding the collar on the mutant near Bulba. The search location is clearly marked on the map, but no one has yet been able to find anything inside the blue search zone.
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Considering that the Bulba anomaly is an extremely dangerous place, searching here is quite difficult, although you can crouch and move along the landscape to avoid any dangerous objects. You can use this method to try to get the Strange Ball artifact between the two vans).
There is a dog behind the fallen tree, but without a collar. At the same time, a sound signal is heard, indicating that the dog's collar should be somewhere nearby, and it can be heard near the yellow excavator.
This hints that the mission may be bugged, but fortunately, it is still possible to complete. If you complete all the other objectives, and then leave the starting zone (the path depends on who you gave the sensors to in STALKER 2), then upon returning to the Smaller Zone, you will receive a message from Nightingale, in which he says that he is in trouble. A new objective will appear - "Help Nightingale".
If you complete this task, you will find Nightingale dead, and an invisible bloodsucker will attack you. Kill him, and take the collar from his corpse. In addition, you can take the collar from Nightingale's body. You will also learn that these collars are bought by Hamster, a merchant in Zalesye. He will also mention that they are needed by a scientist who does not want to come to the Zone.
So, it is unclear whether this was a bug with the collar in the Bulba anomaly, or it was intended by the game so that you could find the collar only after Nightingale dies.