Noise when using Stereo Mixer Delay

Hello,
I notice a clicking noise when I add the Stereo Mixer Delay effect. This noise occurs randomly (it is a click at the beginning of the sound) and I usually detect it after extracting the mixdown. Then, I open the project and go to the point where the noise is heard, sometimes it is heard, sometimes not. It’s random. I always use fade-in, as you can see in the screenshot.

Mixer Delay 24ms - Click Noise 2