Realistically China expects to fight the US in the event of a Taiwan conflict. So whether there are troops there or not is irrelevant, and the bait will not be taken. What would be more concerning is if the US put nuclear weapons on the island; in that case there could be a real crisis and it seems the US is not yet bold enough to risk it.
As much as I am skeptical of China wanting to launch an unprovoked attack on Taiwan, having the island accept or develop nuclear weapons is a guaranteed way to trigger an immediate Chinese invasion.
A nuclear weapons program or even infrastructure projects to support foreign nuclear armaments would take months or years of preparation, all of which would be monitored by Chinese intelligence agents or satellites. I don't think it needs to be debated why China would perceive this to be an existential threat.
As soon as China confirms that Taiwan is about to go nuclear, it will almost definitely launch a military operation to remove that nuclear program or to overthrow its government altogether, regardless of how bloody the conflict might be or how ill-prepared China would be at that time.