So, I'm a little bit confused here. On ERLW pg. 62, from the Homunculus Servant entry, it reads;
"The item you infuse serves as the creature's heart, around which the creature's body instantly forms."
And it continues on to say;
"If it dies, it vanishes, leaving its heart in its space."
Given this, I can see two distinct possibilities of how you would go about reviving the Homunculus Servant.
The infusion fades and you must infuse the gem again.
The infusion remains, and its body reappears after it regains hit points.
Since it doesn't indicate the infusion fades, I'm leaning towards the second option, but I'm not sure. Which case is it, or is it some other option I haven't considered?