https://www.wowhead.com/news/upcoming-death-knight-changes-on-dragonflight-alpha-328569

Everlasting Bond
  • Death Strike and Heart Strike no longer increase the duration of Dancing Rune Weapon while its active.
  • Now increases the duration of Dancing Rune Weapon by 8 seconds.
    • While the act of extending your Dancing Rune Weapon with Heart Strike and Death Strike can be fun, it quickly can overshadow the rest of Blood’s gameplay decisions. In order to address this, we will change Everlasting Bond to be a flat duration increase in addition to its existing mechanic of summoning one extra copy of Dancing Rune Weapon. Our goal here is to open up more options throughout the tree as well as avoid making one style of gameplay feel mandatory permanently moving forward.

자고 일어났는데 이게 뭔 날벼락이여....