Crossing this bridge location at Titan’s Canyon, Imperial Era 1005 AG, Umbral Blades did not travel any distance and would always land at my character’s feet.
The area is about 1/3 of the screen in length. And walking outside of it let’s me throw Umbral Blades normally.
Trying to throw blades into the area from outside of it causes them to stop short before entering it.
Update. Other locations in Monolith of Fate also have this weird issue.
The maps with water areas seem to stop Umbral Blades when you are in deeper sections of the water.
Different map, around a giant bonfire there also seems to be a weird circular area that blocks Umbral Blades’ travel. https://imgur.com/a/mzYBTI9
Yes, I’ve been experiencing the same issue on the Ritual Lake map specifically. It appears that the water or minor elevation changes have a collision texture causing Umbral Blades with the Sword Thrower specialization to get caught on the terrain instead of traveling to the intended location.