Sorry for the necropost and just a heads up, I've been able to repro this bug on PC/Steam version as well, on 2018-07-16. I can provide video if required as I was streaming at the time.
Setting :
Azriel has unlocked the ladder, and has access to the 2nd floor above the 4 gas cylinders.
Short steps :
a. Interact with Conduit, select Extension Cord in inventory
(the extension cord gets plugged, then dropped on the floor)
b. Interact with End of Cord (on the floor)
(the text "Use Plug on..." appears near my mouse cursor)
c. Left-click on Opening
Result : Azriel walks near the Opening. Nothing else.
How I somehow un-glitched it :
1. The plug on ground-level was in its initial position. I threw it at the Opening. That set it to its "thrown" position.
2. I attached the extension to the ground plug, and tried to throw it in the air... to no avail.
3. I moved the sliding crate to the left-most position, climbed on it.
4. From the climbed position I tried to throw the extension plug upwards into the Opening... to no avail. However Azriel commented "It's still not getting up there."
5. I did step 2 once more.
6. I picked up the extension cord on the ground.
7. I did step 1 once more.
8. Climbed up the ladder
9. Tried to use the extension cord on the Opening. "I should probably attach it to something first."
10. Install the Extension Cord on the Conduit.
11. Use "End of Plug" on the ground, (cursor now "Use Plug on...") with Opening (with a Left-click)
Result : This time it worked. Azriel dropped the extension cord through the Opening