Indeed this would be useful. Code that returns TRUE should also interrupt default action just like current command does.

Very cool. Maybe it could be also useful to include display and control eventhandlers added with displayAddEventHandler and ctrlAddEventHandler ? Just for perfection of this new command. But only if it's achievable.

Yes i´m also connected. Campaigns, showcases, time trials and non-workshop missions all appear alright. The problem is workshop missions. Today i tried also verify game integrity trough steam (everything was alright) and then i tried to create new profile and complete workshop mission to see if it´s related to profile or not. Sadly even with brand new profile the issue persists.

Hello. I can confirm the problem. Same thing happend to me after update 2.00 (or 1.98 i´m not sure). All steam missions was completed with use of BIS_fnc_endMission so they all have activeKeys active in user profile. They just don´t seem to apear as completed on mission selection screen. Notice that it applies only to steam subscribed missions. Oldman scenario and pretty sure all missions exported to missions from editor or mod would appear as it should. I´ve loaded the game without mods and DLCs.
In game it looks like this:

Hi guys!

I can confirm that this issue is fixed in development version. Thank you for informing me. I haven´t downloaded development version in months :D.