To reproduce:

1. Open the project, attached by the user (ComputeShaderBugReport.zip)
2. Open the "TestScene" scene
3. Select TexCountTester (16 limit) object and disable Tex Count Tester component
4. Enter Play mode and observe the texture on the left (wrong behavior)
5. Observe the console
6. Disable the Tex Count Tester component on the TexCountTester (bugged) object
7.Enable the Tex Count Tester component on the TexCountTester (16 limit)
8. Enter Play mode and observe the texture on the right (correct behavior)

Expected: sampling more than 16 textures doesn't spam the errors and shows the correct texture

Reproduced in 2017.1.3p1, 2017.2.2f1, 2017.3.0f3, 2017.3.1p3, 2018.1.0b10, 2018.2.0a3

Not reproducible since 2018.1.8f1