Fix #64684

src/vs/workbench/browser/parts/editor/media/tabstitlecontrol.css

@@ -232,6 +232,10 @@
 	padding-right: 5px; /* we need less room when sizing is shrink */
 }
 
+.monaco-workbench .part.editor > .content .editor-group-container > .title .tabs-container > .tab.close-button-off.dirty-border-top > .tab-close {
+	display: none; /* hide dirty state when highlightModifiedTabs is enabled and when running without close button */
+}
+
 .monaco-workbench .part.editor > .content .editor-group-container > .title .tabs-container > .tab.close-button-off.dirty:not(.dirty-border-top) {
 	padding-right: 0; /* remove extra padding when we are running without close button */
 }