When hooking up a depot reader to a fuel depot it causes a crash:

The mod Transport Drones (1.0.26) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Transport_Drones_Meglinge_Fork::on_tick (ID 0)
LuaConstantCombinatorControlBehavior doesn't contain key set_signal.
stack traceback:
[C]: in function 'index'
...port_Drones_Meglinge_Fork/script/depots/fuel_depot.lua:103: in function 'update_circuit_reader'
...port_Drones_Meglinge_Fork__/script/depots/fuel_depot.lua:109: in function 'update'
Transport_Drones_Meglinge_Fork/script/depot_common.lua:360: in function 'update_depots'
Transport_Drones_Meglinge_Fork/script/depot_common.lua:368: in function 'handler'
core/lualib/event_handler.lua:72: in function <core/lualib/event_handler.lua:70>