diff --git a/web/chat/typeahead-tooltip.react.js b/web/chat/typeahead-tooltip.react.js
--- a/web/chat/typeahead-tooltip.react.js
+++ b/web/chat/typeahead-tooltip.react.js
@@ -37,6 +37,10 @@
     setChosenPositionInOverlay,
   ] = React.useState<number>(0);
 
+  const [frozenSuggestedUsers, setFrozenSuggestedUsers] = React.useState<
+    $ReadOnlyArray<RelativeMemberInfo>,
+  >([]);
+
   const overlayRef = React.useRef<?HTMLDivElement>();
 
   React.useEffect(() => {
@@ -45,13 +49,19 @@
     return () => setIsVisibleForAnimation(false);
   }, []);
 
+  React.useEffect(() => {
+    if (frozenSuggestedUsers.length === 0) {
+      setFrozenSuggestedUsers(suggestedUsers);
+    }
+  }, [suggestedUsers, frozenSuggestedUsers.length, setFrozenSuggestedUsers]);
+
   const actions = React.useMemo(
     () =>
       getTypeaheadTooltipActions({
         inputStateDraft: inputState.draft,
         inputStateSetDraft: inputState.setDraft,
         inputStateSetTextCursorPosition: inputState.setTextCursorPosition,
-        suggestedUsers,
+        suggestedUsers: frozenSuggestedUsers,
         textBeforeAtSymbol,
         usernamePrefix,
       }),
@@ -59,7 +69,7 @@
       inputState.draft,
       inputState.setDraft,
       inputState.setTextCursorPosition,
-      suggestedUsers,
+      frozenSuggestedUsers,
       textBeforeAtSymbol,
       usernamePrefix,
     ],