How to fix resource pack entity shader conflict

I have a shader in a regular resource pack that makes the heads of shulkers invisible, but when I enable a shaderpack with Iris, this gets overridden and it goes back to the default state, where the heads don't render transparency. Every shaderpack I try using makes this happen, is there a way I can include my vanilla shader to make this not happen?

Solution:

vanilla/core shaders are incompatible with iris

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