Unexplicable behavior with Configurable Joints

Unity Engine
,
1

[solved]

Unity 202.2.1f1
VR Project

Situation : two rigidbodies attached to a third one via a Configurable Joint
Problem : whatever are the initial parameters of the joints, it doesnt have the expected effect - its basically inactive
Abnormality #1 : if I manually change any parameter of a joint during PIE (through the inspector), it “wakes up” and start acting as expected
Abnormality #2 : if I change the same parameter through script during PIE, even multiple times with a delay between each try, the joint doesnt “wake up”

It seems that the only way for the joint to work is for me to interact with it in the inspector during PIE.
Both joints are created at runtime through AddComponent, so its apparently not caused by some lingering buggy value in the Configurable Joint component

Any clue what could be happening, or things I could try ?

(prefixed as “bug” as I cant see how this behavior could be considered “working as intended”.)

2

Good old “get stuck on a problem for a few days, post the question somewhere and instantly find an anwser” happened.

While I still cant explain that weird “inspector = awaken” / “value change = no effect” part, I could trace the culprit to one of my scripts dealing with physics. As its a whole separate system, I just disabled it for the time being, ill check how to fix later.