When compared to the live server, Blastbone does not seem to function the same way anymore. Instead of being summoned in front of the player casting the skill, it is instead summoned further behind the player to the right.

This is the cast on Live server


While this is the one currently on the PTS


While this may not appear like a huge deal at first, it greatly increases the cast time of the skill. Mostly noticeable while parsing on the Trial Dummy, the average cast time goes up by an entire second for Blastbone alone. This causes a substantial loss of damage.
While on live, a usual necromancer rotation consists of Blastbone followed up by 2 other skills, on the pts it's currently Blastbone followed up by 3 skills. Unless you are standing as close to the dummy as possible, and even then a substantial difference can be felt when compared to live. It feels like the Blastbone needs a longer time "to aim" onto the target,

Here is a video, showcasing how it looks on both live and pts:
https://www.youtube.com/watch?v=oOERNiVxuBg&ab_channel=Djmuscleboy02

Another thing that I noticed with Blastbone, is that the corpse produced by it seems to almost instantly disappear whenever a new Blastbone has been casted. This makes it almost impossible to use Detonating Siphon in a "semi-spamable" kinda fashion.

No such changes were mentioned anywhere in the patch notes, which leads me to believe that this is a bug. I hope to bring more attention to it, as Necromancer is my favorite class.