vite打包css时，hack写法\9打包后变成\,如何保留\9或者删除这种css

.ctotest-class {
  /*# box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); */
  box-shadow: 0 2px 8px #00000026;
  /*# box-shadow: 0 0 8px rgba(0, 0, 0, 0.15) \9; */
  box-shadow: 0 0 8px #00000026 \9;
  height: 100px;
}

.ctotest-class{box-shadow:0 2px 8px #00000026;box-shadow:0 0 8px #00000026 \	;height:100px}.