I've been noticing a marked increase in the frequency of 'ghost rooting' since the Sunday, Dec 15 2019 patch. The linked video showcases an example of this occurring in Velketor's Labyrinth in the area between the Crystal Eyes ph and the Frenzied Velium Broodling ph.
2019 12 16 Ghost Root in Velketor's Labyrinth
I was root-rotting two spiders on the ramp between CE and Broodling. Each spider broke root while on the ramp and pathed towards my location next to the Broodling ph spawn point, then ghosted when I re-rooted them. Both ghost roots occured near location +428, +113, +36.75 in Velketor's Labyrinth.