Description of the issue:

rs.getBundledInput() does not properly return the sum of all color values, but instead always 0.
rs.testBundledInput() does work and indicates there is a signal for the color lightBlue (8), as seen here:

Versions & Modlist

ImmersiveEngineering 1.16.5-4.2.1-131 running on Forge 36.0.13

This is on CCs side: getBundlednput is actually a second getBundledOutput. Use testBundledInput for now.

Edit: Ah, you discovered the workaround already. Reading issues before replying to them would be smart.