The toilet in the master bathroom was smelly after flushing it, so I sought the help of a new crew to examine the issue. They removed the toilet, assessed the situation, and concluded, "No good" in Thai. With the aid of Google Translate, they explained that the previous worker had simply placed the toilet hole directly on the tile, sealing it with a brittle grout-like material. As a result, gasses from the drain were escaping.

To rectify the issue, they inserted a rubber type of gasket halfway into the hole in the floor, which they then fitted through the bottom of the toilet. They added a rubber seal around the toilet, sealed everything with cement, and then applied black silicone as a finishing touch. At least that's what I deduced from observing their work (fun fact: I'm not a certified plumber).

While it was frustrating to pay for corrections to the mistakes made by a worker I had already compensated, I'm relieved to have things done as they should be.