fix tab divider

docs/resources/changelog.md

@@ -11,6 +11,7 @@ _During the beta period, these restrictions may be relaxed in the event of a mis
 ## Next
 
 - Changed the type of component styles from `CSSResult` to `CSSResultGroup` [#828](https://github.com/shoelace-style/shoelace/issues/828)
+- Fixed a bug in `<sl-tab-group>` where the divider was on the wrong side when using `placement="end"`
 - Updated Bootstrap Icons to 1.9.1
 
 ## 2.0.0-beta.78

src/components/tab-group/tab-group.styles.ts

@@ -205,7 +205,7 @@ export default css`
   .tab-group--end .tab-group__tabs {
     flex: 0 0 auto;
     flex-direction: column;
-    border-right: solid var(--track-width) var(--track-color);
+    border-left: solid var(--track-width) var(--track-color);
   }
 
   .tab-group--end .tab-group__indicator {