Hard Mode Issue When Toggling to Medium Mode

[puff-m-d]

Read first: https://github.com/gorhill/uBlock/blob/master/CONTRIBUTING.md

Describe the issue

My blocking mode that I use is "Hard Mode"...
When doing the following on any site:
"With a single click, it is possible to toggle the hard mode into the medium mode: it's just a matter of assigning a local noop rule to the 3rd-party cell." ---from the wiki: https://github.com/gorhill/uBlock/wiki/Blocking-mode:-hard-mode
Once you have toggled to medium mode on any site, you cannot set a local noop rule for any of the 3rd-party domains. You must first go back to hard mode to set the local noop rule for the 3rd-party domain after which you can return to medium mode.

One or more specific URLs where the issue occurs

This happens with all URLs but I can use this one for an example:
http://www.majorgeeks.com/
[URL(s) for issue on a specific site are mandatory]

Screenshot in which the issue can be seen

[Screenshot(s) for visual issues are mandatory]

Steps for anyone to reproduce the issue

1. Be as detailed as possible:
2. Because we are not looking over your shoulder and
3. Keep in mind: Nobody can read your mind.

Ensure that you are in Hard Mode.
Go to the example URL that I listed above.
Toggle the hard mode into the medium mode by assigning a local noop rule to the 3rd-party cell.
Try to set a 3rd-party noop rule and notice that you cannot do so. In my screenshot above, for example, I was trying to noop "disqus.com" and cannot do so.
I can, however, create an allow or block rule.

Your settings

[If you fail to provide this info, I will mark the issue as invalid. Lists all settings which differs from default settings]

• Browser/version: Google Chrome Version 55.0.2868.3 dev (64-bit)
• uBlock Origin version: 1.9.10
• Operating System: Windows 10 Pro Version 1607 OS Build 14393.187

Your filter lists

Should not be required but I will supply if requested.
[Example: "Default filter lists + FRA", or "Default filter lists minus uBlock -- Badware risks"]

Your custom filters (if any)

Should not be required but I will supply if requested.