I will gather all known problems here

- building_machine_assembly_plant uses icon from robot_assembly_plant, which is not upgradable and does not have tier 1 symbol.
fixed in 3.6 version, robot_assembly_plant is upgradable now.

- building_simulation_3 uses icons from building_citadel_of_faith, which is not upgradable and does not have tier 3 symbol.

- building_sensorium_3 uses icons from building_citadel_of_faith, which is not upgradable and does not have tier 3 symbol.

- building_crystal_plant can be upgraded to tier 2, but it's the outcome of rare event, so I decided to leave it without tier 1 symbol to escape confusion.