"Do a Scan" missions never complete

[politas]

I've tried several times to use the scanning arms to complete a mission. I have a mission "Do a complex scan of a Mun Crater on the Mun". I get my rover to a Mun Crater, scan it with the right scanning arm, my experiment details appear, "Mun Crater Scan from the Mun's Midlands", I transmit it, no problems all goes through fine, but the contract still shows 0% completion!

The same thing happened scanning a Baobab Tree on Kerbin - 0% mission completion, no matter what scanning arm I used.

[Godot]

I have the same problem, but also a workaround:

It seems like my first scanning arm rover use after accepting such a mission always fails to fulfill the missions parameters.

But if I send a second rover, he manages to complete the mission.

 

Therefore, i the first rover fails to complete the mission I nowadays just send in a 2nd rover ... has always worked so far

[akyyy]

I have the same problem, send other rover, but not working. Mission not succes. 
(giant quartz,  green sandstone)