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When a robot try to deconstruct the entry point of an underground belt with items inside it takes the items inside(all of them) and deconstruct it. The underground belt get erased from existence and only the items inside it get transported. The exit underground belt is deconstructed normally.

Explaining Gif:

http://gfycat.com/GrandUniqueChameleon

Ah, so that explains what happened at 02:58 in the recent video by FKODGaming for the Hydra Dilemma:
https://www.youtube.com/watch?v=03gkdy_esRg

(Smart Inserters are not a bug, they were all delivered to create blue science packs.)

Redominus wrote:When a robot try to deconstruct the entry point of an underground belt with items inside it takes the items inside(all of them) and deconstruct it. The underground belt get erased from existence and only the items inside it get transported. The exit underground belt is deconstructed normally.

Explaining Gif:

http://gfycat.com/GrandUniqueChameleon

I looked into it and actually the issue was worse than that only the first item the belt is holding gets picked up (up to a maximum of what the robot can hold). Everything else is erased: all other contents the belt holds + the belt.

Thanks to Rseding, the issue is now fixed for 0.10.10