Notice

• If </script> is intended as a closing tag but does not appear at the beginning of a line, syntax highlighting will also break (though single-line <script> tags are not affected):

  <!-- bad -->
  <script setup lang="ts">
  const a = 1;</script>
  
  <!-- good -->
  <script setup lang="ts">const a = 1;</script>
  <script setup lang="ts">
  const a = 1;
  </script>

• If </script> appears as a string and at the beginning of a line, syntax highlighting will break:

  <script setup lang="ts">
  const a = `
  </script> <- break
  `;
  </script>

  However, since </script> as a string currently is also not supported by @vuejs/core, so this issue has no impact.
  Ref: </script> in script block breaks SFC parsing core#7391