diff --git a/extensions/telegram/src/config-schema.test.ts b/extensions/telegram/src/config-schema.test.ts
index 728719f9b84d..d6aad9d21703 100644
--- a/extensions/telegram/src/config-schema.test.ts
+++ b/extensions/telegram/src/config-schema.test.ts
@@ -166,6 +166,19 @@ describe("telegram custom commands schema", () => {
     }
   });
 
+  it("preserves rich message inheritance for account overrides", () => {
+    const res = TelegramConfigSchema.safeParse({
+      richMessages: true,
+      accounts: { ops: {} },
+    });
+
+    expect(res.success).toBe(true);
+    if (res.success) {
+      expect(res.data.richMessages).toBe(true);
+      expect(res.data.accounts?.ops?.richMessages).toBeUndefined();
+    }
+  });
+
   it("normalizes custom commands", () => {
     const res = TelegramConfigSchema.safeParse({
       customCommands: [{ command: "/Backup", description: "  Git backup  " }],
diff --git a/src/config/zod-schema.providers-core.ts b/src/config/zod-schema.providers-core.ts
index bcb729b56634..07e1a88227fd 100644
--- a/src/config/zod-schema.providers-core.ts
+++ b/src/config/zod-schema.providers-core.ts
@@ -281,7 +281,7 @@ export const TelegramAccountSchemaBase = z
     dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
     direct: z.record(z.string(), TelegramDirectSchema.optional()).optional(),
     textChunkLimit: z.number().int().positive().optional(),
-    richMessages: z.boolean().optional().default(false),
+    richMessages: z.boolean().optional(),
     streaming: TelegramPreviewStreamingConfigSchema.optional(),
     mediaMaxMb: z.number().positive().optional(),
     timeoutSeconds: z.number().int().positive().optional(),