Trigger is not executed

Hi,

I have one 2D Object

Rocket

with a Rigidbody2D and a Capsule Collider 2D which is set to isTrigger.
I have another empty game object

Border

which has a line collider attached.
The code for

A

is:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Rocket : MonoBehaviour
6. {
7.     public Rigidbody2D rb;
8.     public float thrust = 300f;
9.     // Start is called before the first frame update
10.     void Start()
11.     {
12.         rb = GetComponent<Rigidbody2D>();
13.     }
14.  
15.     // Update is called once per frame
16.     void Update()
17.     {
18.     }
19.  
20.     void OnMouseDown()
21.     {
22.         //rb.AddForce(transform.forward * thrust);
23.         rb.AddForce(transform.up*thrust);
24.     }
25.  
26.     private void OnTriggerEnter(Collider other)
27.     {
28.         print("Collided, rotating");
29.         transform.Rotate(Vector3.forward * (360 - transform.rotation.eulerAngles.z));
30.     }
31.  
32. }
33.  

OnTriggerEnter

is never called, even when they obviously do collide (I made sure that

Rocket

moves slow enough s.t. they do collide). As soon as I deactivate the

isTrigger

property on

Rocket

, they collide and the the collision is resolved by the physics system. I checked the collision matrix, everything there is set to true. I also tried adding a kinematic Rigidbody to

Border

which did not help.

Does anyone know what could cause this?
Thanks

 

I now also tried to set both as

isTrigger

with no luck

 

I used the 3D methods instead of the 2D methods which of course did not get triggered...