Spectral Shield throw of trarthus bug.

The projectile behaviour on SST of Trarthus seems to be bugged/inconsistent The original shield is capable of splitting when used with snipers mark however it will not split the shield with fury valve.

Fury valve behaves entirely differently with this skill and instead of splitting the initial projectile it casuses the secondary projectile to split instead, only firing a single projectile shard from the shield.

This works entirely different from the base shield throw gems which do split the initial shield with both snipers mark and fury valve.

Is this a bug or is it intended? Should snipers mark work at all? or should fury valve split the initial shield?