White Materials

I upgraded my project from Unity 2020.1 to 2021.1, and in my project I use compute shader to render my grass. This was working well in the last Unity version I used but since upgrading, the grass are being rendered completely white. Makes me wonder how much did the update affect compute shaders?

2020.1 = api 8x
2021.1 = api 11x

shaders compiled in 8x will not work in api 10x or api 11x without a new compile