So, the way the game currently works both for official missions and Foundry missions is it saves your progress at each new map transition. So if you stop doing a mission half way through, when you go back to that mission it will place you at the beginning of the last map you were on. For official missions, it takes you straight there. However, for Foundry missions you have to make a quick jump through each previous map until you get to the one you were on last before you quit the mission.

Are there any plans to make it like official missions so it takes you directly to our last map when you resume a mission you were playing before?

As far as I have tested, this only heppens if the author has republished since your last play through. Doesn't over look the fact that it needs fixing though.

I've noticed this on every (player made) mission I have decided to take a break on.

I've noticed this too.
It breaks the story flow (though I guess, so does taking a break too) but it would be nice if they had the same mechanics as the official missions.
But if it means taking time out of new content for foundry, then for me it's not worth it, at least not yet. do it when the Foundry has a solid base of content.

i agree with this....i also find it irritating

i agree. it does break the flow of the story so it needs to be fixed!