Replay #3680094
Basically, after an assisting engineer has been paused and unpaused, they behave as if they are stopped, i.e. they won't do anything until issued orders again, yet will appear to be assisting still.
I've made a 7.5 minute replay to demonstrate.
When assisting, and then paused, engineers (at least Aeon T1) will continue to appear to assist, i.e. their "construction beam" will still be glowing.
If unpaused, their beam will still be going, and the "pause" icon on them will disappear, yet they won't actually be doing anything. The only way to actually know if they are doing anything is by resource consumption, and hovering over them with the mouse.
If they are right-clicked onto the object, they will then assist as intended.
If assisting a factory, or an ACU with multiple upgrades, they will actually assist when the current unit/upgrade is completed, but not before.