I falling under the floor
I wase making a quest then i fall look at the print screen !!
I, too, have experienced this bug. Like yourself, I am playing a Mesmer. I’ve fallen through the floor almost a dozen times. The first time it happened, I submitted a report to Anet in game using the in-game report feature.
To add some information to this, it only happens when I use the “Phase Retreat” skill (2nd skill with a Staff equipped). It happened frequently in various buildings in Metrica Province, but also happened numerous times near the Jetsam Isle Point of Interest within Lornar’s Pass.
I hope this gets fixed soon. Currently I’m afraid of using Phase Retreat as it currently stands.