It's almost certain that 2017 FL36 was active in 2017. This is my current list of items in the asteroid file which are too bright to be inactive and yet only observed on a single opposition, so you can infer that they were likely active during their one apparition. There are a few others that have been removed from this list when they were moved to the comet orbits list. The first 6 of them I'm more or less certain of. The last 3 are simply suspected as being active, and there's some small chance that they are ordinary and have simply been missed due to bad luck for the surveys in recovering them.
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Also, given the clear activity of 2017 FL36 in the Subaru images, it removes all doubt for me. It's a formality though that makes sense¡ªMPC needs a second report of activity and without that it remains on the PCCP even though it's certainly an active asteroid. I also don't fully understand what the policy is regarding single-opposition active asteroids and whether they always move them to the comet orbits file or sometimes prefer to leave them in the asteroids orbit file since the orbit is asteroidal.
Mira-Ao