Have you ever reset a tile with silicone instead of mixing up thinset?
I have done this once on a tile floor a while ago. It was a tile in the corner of the room, along the toilet, up against the edge of the floor where it meets the wall, I had set the tile in place as a guide for another row of tiles and somehow never taken it back up to thinkset it, I didn't discover it til the next morning when I was going to grout and it moved. In a moment of laziness with a bag of thinset 1 story down and having to be mixed, cleaned up and dealt with, the tub of grout drying out, and the silicone caulk gun laying 2 feet away I siliconed it and stuck it in place and continued to grout.
I have done this once on a tile floor a while ago. It was a tile in the corner of the room, along the toilet, up against the edge of the floor where it meets the wall, I had set the tile in place as a guide for another row of tiles and somehow never taken it back up to thinkset it, I didn't discover it til the next morning when I was going to grout and it moved. In a moment of laziness with a bag of thinset 1 story down and having to be mixed, cleaned up and dealt with, the tub of grout drying out, and the silicone caulk gun laying 2 feet away I siliconed it and stuck it in place and continued to grout.