After many years I have decided never to tile on wood or anything similar thats floating ...... nightmare. Builders should stop cost cutting and put solid floors down.
Those tiles are ceramic from British Ceramic Tiles.....
Another one bites the dust.
The tiles are not suitable for your project. Yes, the tiler could have laid cement construction boards on top of the chip board and that may have helped but the crack is mainly due to the tiles not being strong enough for flooring.