Here you go, as you can see, when SIGTERM is received, the log ends, but it doesn't say anything about saving chunks, saving player data, or anything like that.
Still an issue in 1.16.3, superflat world nets 150-200fps (heavily fluctuates, not stable framerate), while 1.14.4 superflat world nets 250-300 fps (stabilizing around 300).
This happens to me also