Marble mason disappeared

Recently I noticed that I could place a building in a section usually taken up by a marble mine. I moved a marble mason there and then rediscovered the marble in an attempt to get a good image for the screenshot of the week contest.

http://i.imgur.com/hkfKPsK.jpg?1

When I signed on this morning, however, I discovered that when the marble mine exhausted itself, the marble mason disappeared! Finding the deposit again did not restore the marble mason to its position. :(

http://i.imgur.com/I6VYpLO.jpg

I have never received a response to a support request on any other issue - I'm hoping posting in the forum will have better results.

that spot is bugged. it happend to a guildy of mine, except he did it with a deeded noble. same thing happend to him, except it didnt coincide w the quarry depleting, he never found the marble there. the noble was just gone the next time he logged in. im curious if you got ur building lisence back from that mason? if not this really is a huge issue, especially if a new player places a building there not knowing that the spot is bugged.

I did get the building license back, but as you can see it's a level 4 marble mason and I am not happy to have to spend the resources and time to rebuild it. No response from support per usual.