Renault Laguna - squeaking 30 seconds after locking the car with the remote cont

Hello.
I have this problem: for some time, when I lock the car (Renault Laguna 3, 2010) with the remote control, a Squeak comes out in the rear part of the car, behind the passenger's door, which lasts about 30 seconds. Then it goes quiet and it's ok. The car is locked. It seems to me that this is some kind of detector, but what can this detector be from and how to fix this squeaking? Yesterday all the locks on the doors were patched with a special preparation, 4 cubes by the door too (the big yellow ones that lead electrics to windows, lights, etc.). Nothing helped. Maybe someone also had such a problem?
PS The battery is new, so that's definitely not it.

The fuel flap lock actuator comes to mind. But he's on the right ...

it was the hood opening sensor it's ok now

It's good that we managed to locate it .

Hello, I have exactly the same problem, could you describe in more detail the repair of this?

In my case, the same as above. The squeaking started after replacing the LEDs in the factory-installed daytime running lights.
The squeaking is also heard while driving the car as well as immediately after opening and closing for about 20 seconds

If anyone had such a problem, my mask was simply not closed properly. I had to open and close properly Which is very strange because on the display there was an error - "Check childproofing" Just today I had the same thing again and I found my thread from years ago and it helped again