shared texture sampler doesn't work in mobile

In mobile preview or android device in 5.1 release, M_SharedTexture_Inst material does not render properly due to exceeded sampler slot limit.

there was no problem in 5.0.3

1. open attached project from FPS501.zip file
2. click Settings > preview Rendering Level > Android ES 3_1

test result :  M_SharedTexture_Inst material does not render properly

(refer to attached video for repro)

[UE-23848] Bug Status

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