Wrong flow logic regarding Airtight Pipe entry/exit

[Singularis]

Placing a pipe on the side of Airtight Pipe entry/exit causes wierd water flow behaviour.

How to reproduce:

• Place Pump/Intake Module to the water.
• Go one node above it and place a pipe there.
• Go one node to the west and place a pipe there.
• Go one node to the west and place an Airtight Pipe entry/exit there, oriented west-east (this will connect to the tube segment).
• Go one node to the west and place a pipe there.
• Go one node to the north and place a pipe there.
• Go one node to the east and place a pipe there.
• Enable the Pump/Intake Module and wait till all pipe segments get loaded.
• Disable the Pump/Intake Module.

Expected behaviour: After disabling the pump, all pipe segments should become empty.

Observed behaviour: Pipe segments are switching between empty and loaded state periodically, probably due to error in the flow logic.

Used Minetest 5.6.1 (Minetest Game) with basic_materials, dreambuilder_hotbar, pipeworks and unified_inventory mods.

[Luke aka SwissalpS]

I have achieved similar effect using water tank. I call it a water blinky ;)