diff --git a/src/common/stores/chat/chat.fragments.ts b/src/common/stores/chat/chat.fragments.ts
index 201e101b0..3f58e250f 100644
--- a/src/common/stores/chat/chat.fragments.ts
+++ b/src/common/stores/chat/chat.fragments.ts
@@ -153,7 +153,7 @@ type DMessageToolEnvironment = 'upstream' | 'server' | 'client';
 
 type DVoidModelAuxPart = { pt: 'ma', aType: 'reasoning' | string, aText: string };
 
-type DVoidPlaceholderPart = { pt: 'ph', pText: string };
+type DVoidPlaceholderPart = { pt: 'ph', pText: string, pType?: 'chat-gen-follow-up', /* 2025-02-23: added for non-pure-text placeholders */ };
 
 type _SentinelPart = { pt: '_pt_sentinel' };
 
@@ -292,8 +292,8 @@ export function createModelAuxVoidFragment(aType: DVoidModelAuxPart['aType'], aT
   return _createVoidFragment(_create_ModelAux_Part(aType, aText));
 }
 
-export function createPlaceholderVoidFragment(placeholderText: string): DMessageVoidFragment {
-  return _createVoidFragment(_create_Placeholder_Part(placeholderText));
+export function createPlaceholderVoidFragment(placeholderText: string, placeholderType?: DVoidPlaceholderPart['pType']): DMessageVoidFragment {
+  return _createVoidFragment(_create_Placeholder_Part(placeholderText, placeholderType));
 }
 
 function _createVoidFragment(part: DMessageVoidFragment['part']): DMessageVoidFragment {
@@ -372,8 +372,8 @@ function _create_ModelAux_Part(aType: DVoidModelAuxPart['aType'], aText: string)
   return { pt: 'ma', aType, aText };
 }
 
-function _create_Placeholder_Part(placeholderText: string): DVoidPlaceholderPart {
-  return { pt: 'ph', pText: placeholderText };
+function _create_Placeholder_Part(placeholderText: string, pType?: DVoidPlaceholderPart['pType']): DVoidPlaceholderPart {
+  return { pt: 'ph', pText: placeholderText, ...(pType ? { pType } : undefined) };
 }
 
 function _create_Sentinel_Part(): _SentinelPart {
@@ -396,7 +396,7 @@ function _duplicate_Part<TPart extends (DMessageContentFragment | DMessageAttach
       return _create_ModelAux_Part(part.aType, part.aText) as TPart;
 
     case 'ph':
-      return _create_Placeholder_Part(part.pText) as TPart;
+      return _create_Placeholder_Part(part.pText, part.pType) as TPart;
 
     case 'text':
       return _create_Text_Part(part.text) as TPart;
diff --git a/src/common/stores/chat/chat.message.ts b/src/common/stores/chat/chat.message.ts
index 65442a313..54809662c 100644
--- a/src/common/stores/chat/chat.message.ts
+++ b/src/common/stores/chat/chat.message.ts
@@ -112,7 +112,7 @@ export function createDMessageTextContent(role: DMessageRole, text: string): DMe
 }
 
 export function createDMessagePlaceholderIncomplete(role: DMessageRole, placeholderText: string): DMessage {
-  const placeholderFragment = createPlaceholderVoidFragment(placeholderText);
+  const placeholderFragment = createPlaceholderVoidFragment(placeholderText, undefined);
   const message = createDMessageFromFragments(role, [placeholderFragment]);
   message.pendingIncomplete = true;
   return message;