ACU upgrades cancellation

[Zaj]

edit: kind of solved, the STOP button on the bottom left command actions bar is supposed to be used. DEAR LORD please make the clicking on the progress button work too!
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I guess this is a simple question, sorry if this doesn't warrant a thread but I couldn't see any general help thread opened where I could ask this and at this point in time FAF client aeolus chat is dead or my connection problems continue.

The question is:
Are there ACU upgrades that can't be canceled no matter what? I got killed in a game in which my Cybran ACU was upgrading it's weapon but either to cancel this something different than clicking on progress button is needed or I have just no idea what the hell happened, 5 minutes later I lost connection to everything FAF, forums included, so maybe this was the reason?

[Uveso]

The reason for not clicking a button for stopping the ACU from upgrading is simple.

You need to much time to klick at the ACU, then move the mouse over the stop button klick it, and move the mouse back to the commander.

We just klick the ACU and hit [s] on the Keyboard!

If you think this should be added to the game, then open an Isssue on Git hub for it:
https://github.com/FAForever/fa/issues

Name id like "Enhanced ACU upgrade cancel" or something like that.
Write what you want to be added and how exactly it should work.

Then we can discuss this, and it will be "maybe" added.