MS Teams bot chat message showing double suggested actions on mobile

Sending a message from the bot to Teams with suggested actions works fine on desktop and web, but the suggestions are shown twice in the mobile Teams app (Android and iPhone). They are shown 1st as part of the message, and then as separate suggestions. In addition, on iPhone, if the next message is sent without suggestions, the separate suggestions stay on the screen. If you leave the chat and come back, they disappear.

This is a serious issue because we have many customers using the bot, many of them on mobile.

Sample message looks like this:

{
  "type": "message",
  "serviceUrl": "https://smba.trafficmanager.net/amer/*****/",
  "channelId": "msteams",
  "from": {
    "name": "Costpoint",
    "role": "bot",
    "id": "28:*****"
  },
  "conversation": {
    "id": "a:*****",
    "type": "personal"
  },
  "locale": "en-US",
  "inputHint": "acceptingInput",
  "id": "******",
  "localTimestamp": "2026-07-15T15:11:01.000Z",
  "timestamp": "2026-07-15T15:11:01.000Z",
  "text": "Hi! How can I help?",
  "attachments": [],
  "suggestedActions": {
    "actions": [
      {
        "type": "imBack",
        "title": "#New topic",
        "value": "#New topic"
      },
      {
        "type": "imBack",
        "title": "Enter time",
        "value": "Enter time"
      },
      {
        "type": "imBack",
        "title": "Sign time",
        "value": "Sign time"
      }
    ]
  }
}

Desktop:

Android:

iPhone: