Since around November last year, I heard of garden keepers the first time, took my Lif there.
Took so long to put one down, with all the running-around. (Lif's graceful aspd didn't help

)
but In February I tried again with a thief, went successfully well! They stood facing me, spiking earth, driving heaven, but didn't run around as much, or at all.
why...?
my wild guesses were
a) GMs kept a close watch, made adjustments
b) Keepers treat homun's and player's attack differently
c) they grew curious about human