Bullet Dance scales its duration with spirit power, so the duration should be extended due to these items. These items will increase Bullet Dance duration if you proc the bonus spirit power before casting Bullet Dance, although this was not necessary before. If you cast Bullet Dance while in Shadow Weave, the bonus spirit power does not effect it. Similarly, Spiritual Overflow used to extend Bullet Dance duration if it was procced by Bullet Dance, but now it does not - you need to proc Spiritual Overflow before casting Bullet Dance.
In these situations, you can see the total duration of the cast extend when the proc occurs, but only the empty part of the bar - the remaining time left on the cast does not increase like it used to.
In these situations, you can see the total duration of the cast extend when the proc occurs, but only the empty part of the bar - the remaining time left on the cast does not increase like it used to.