diff --git a/packages/dsh-desktop-workbenches/client.js b/packages/dsh-desktop-workbenches/client.js
index c7d0bd912..8f1c41fba 100644
--- a/packages/dsh-desktop-workbenches/client.js
+++ b/packages/dsh-desktop-workbenches/client.js
@@ -1062,8 +1062,13 @@ window.__ModuleLoader__.load({
     `
     function ensureStyles() {
       const existing = document.querySelector('style[data-plugin-css="dsh-desktop-workbenches"]')
-      if (existing) { if (existing.textContent !== css) existing.textContent = css; return }
+      if (existing) {
+        existing.dataset.plugin = 'dsh-desktop-workbenches'
+        if (existing.textContent !== css) existing.textContent = css
+        return
+      }
       const style = document.createElement('style')
+      style.dataset.plugin = 'dsh-desktop-workbenches'
       style.dataset.pluginCss = 'dsh-desktop-workbenches'
       style.textContent = css
       document.head.appendChild(style)
diff --git a/test/workbench-client.test.mjs b/test/workbench-client.test.mjs
index 4cc383fa1..d1c99da8e 100644
--- a/test/workbench-client.test.mjs
+++ b/test/workbench-client.test.mjs
@@ -721,11 +721,19 @@ describe('desktop workbench client navigation', () => {
     const cleanup = styleEffect()
     cleanup?.()
     expect(styles).toHaveLength(1)
+    expect(styles[0].dataset.plugin).toBe('dsh-desktop-workbenches')
     expect(styles[0].textContent).toContain('.dshWbWorkbenchHome')
     expect(styles[0].textContent).toContain('height:232px;flex:0 0 232px')
     expect(styles[0].textContent).toContain('-webkit-line-clamp:4')
     styleEffect()
     expect(styles).toHaveLength(1)
+    styles[0].dataset.plugin = 'another-plugin'
+    styleEffect()
+    expect(styles[0].dataset.plugin).toBe('dsh-desktop-workbenches')
+    styles[0].remove()
+    styleEffect()
+    expect(styles).toHaveLength(1)
+    expect(styles[0].dataset.plugin).toBe('dsh-desktop-workbenches')
   })
 
   it('restores workbench styles after head changes without a React rerender and stops observing on disposal', async () => {