Guild Wars 2

I’ve seen quite a few times recently where thief caltrops from the trait “uncatchable” under the Trickery trait do not remove thief from stealth. I’ve seen situations where thieves will remain in stealth and dodge over the opponent repeatedly to stack bleeds; there’s little to counter this.

Working as intended. The application of conditions doesn’t cause revealed.
As to no counter you can walk out of the caltrops. It can be certainly annoying but it isn’t dangerous.