ForceGreeting doesn't work for disabled actors

As title says.

Morrowind.exe allows you to initiate dialogue with disabled actors using the ForceGreeting command from a script. In OpenMW this doesn't work.

I created a simple plugin that reproduces the issue: disableForceGreeting_test.ESP

Steps to reproduce:

player->PositionCell -11178.3 -70688.5 262.347 146.459 "Seyda Neen"
In front of you should be a lever with the name "Press This"
Activate the lever. In Morrowind.exe, this starts a dialogue with a creature with the id scamp_disabled. In OpenMW, this does nothing.

Is the problem OpenMW specific or does it also happen in vanilla Morrowind?
- OpenMW specific
What is your operating system?
- Windows 10
What version of OpenMW are you using? If you used a bleeding edge build, state the exact revision used.
- 6b3c47a3
What version of Morrowind are you using (i.e. retail CD or Steam)? What addons (Tribunal, Bloodmoon) do you have installed? What language is your Morrowind install?
- Not relevant, but English GOG version
Do you use any mods? If so, does the problem also occur in a clean vanilla install without any mods?
- Problem is mod specific, I'm not aware of any examples from the vanilla game that would be using this method
What are the exact steps to reproduce the problem?
- As explained above
What did you expect to happen? What happened instead?
- As explained above
Are there any error messages in your openmw.log file? If you're not an OpenMW team member, it's best to upload it.
- Not relevant
What settings do you use? If you're not an OpenMW team member, it's best to upload your settings.cfg.
- Not relevant
Where is the in-game location this problem can be observed? Avoid vague statements such as "west of town X". Instead, open the console (` key by default, the key above Tab), click on the problematic object, then use the betacomment (bc) instruction to get useful information about the object that you can copy and paste into the bugreport:
- As explained above