What am I expecting: if the script is attached and the intensity is zero - nothing happens.
What I get (0 and 0.25 intensity. 33fps gif):


PS: In the "Analog Glitch" script, this doesn't happen.
PSS: Also I get a warning, I do not know if it's related to the problem or not:
Tiled GPU perf. warning: RenderTexture color surface (1280x720) was not cleared/discarded, doing
UnityEngine.Graphics:Blit(Texture, RenderTexture)
Kino.DigitalGlitch:OnRenderImage(RenderTexture, RenderTexture) (at Assets/Scripts/Glitch/DigitalGlitch.cs:117)