Shader on iOS device not working with quads

I have a basic unlit/transparent shader. When I attach it for a quad it works on editor, but not on iOS device. Works with planes everywhere! Any ideas?

Shader "Custom/unlittransparent" {
     Properties {
         _Color("Color & Transparency", Color) = (0, 0, 0, 0.5)
     SubShader {
         Lighting Off
         ZWrite Off
         Cull Back
         Blend SrcAlpha OneMinusSrcAlpha
         Tags {"Queue" = "Transparent"}
         Pass {
     FallBack "Transparent/Diffuse"

Changing the quads to static fixes the issues. Probably something related to dynamic batching, which is enabled in the device builds…?