i could build and delete the compact combinator without problems, and enter and leave too, but only when built manually. when i placed a compact combinator ghost and my bots (drones from the "construction drones" mod by klonan) built it, it didn't show the four letter icons in the center and on clicking on it, the mod crashed with this message :

The mod Integrated Circuitry (0.1.8) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event integratedCircuitry::on_gui_opened (ID 83)
integratedCircuitry/control/compact-combinator.lua:61: attempt to index local 'data' (a nil value)
stack traceback:
integratedCircuitry/control/compact-combinator.lua:61: in function 'open'
integratedCircuitry/libs/control/gui.lua:124: in function <integratedCircuitry/libs/control/gui.lua:114>

If there's setup being done on a built event, it'll need to trigger for bot built events too. I think there's like 5 different events now that you need to listen for to capture all possible ways of building something.

script.on_event(defines.events.on_built_entity, on_built)
script.on_event(defines.events.on_robot_built_entity, on_built)
script.on_event(defines.events.script_raised_built, on_built)
script.on_event(defines.events.script_raised_revive, on_built)
script.on_event(defines.events.on_entity_cloned , on_built)

Thanks, didn't know these events exist.
Fixed with 0.18.0 (soon to be released)