Shader renders differently in editor and in exported app

Ok, t$$anonymous$$s drives me crazy now.

I made (adopted) t$$anonymous$$s shader - a simple wave propagation effect.

It looks fine when I run in the editor:

But if I build a standalone app, the screen is full of artifacts:

What can be the cause? Why it is different in editor and in the built app on the same computer? Is there any extra checks in the shaders when running in the editor or somet$$anonymous$$ng?