If you look at the chat discussion I posted in the forum thread, you’ll see that a couple of people did report back after using convention Tix, no issues at all at gate reported.
I’m using one in a couple of weeks, as are several others, so hopefully we’ll have some more reports to share.
Personally, don’t think there is anything to worry about. For example: if I were attending a convention and my family were going to the park on convention Tix without me, how would Disney verify that? I think it is difficult to track various conventions and who is using what tickets.
Once you have them in MDE, I suspect they just look like any other Tix to CMs at tapstiles.