When 3d fog is changed colour it disappears

How do I...?
1

I want to change the fog colour using events. when i change the colour it seems to lose its effect.

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you can see some fog effect on the ground. but it seems to lose its ability to be…well…fog lol

IF I CHANGE JUST THE DENSITY IT WORKS FINE, ONY THE COLOUR CHANGE CAUSES THIS

2

Colors are usually written like this in GDevelop:
image

Also, there is a tween action dedicated to change effect colors.