Telegram notifications flooding Pebble Time with old unread messages

Hi! I’m having an issue with Telegram notifications on Android forwarding to my Pebble Time (2015). I’m using the new Pebble app.
When a new message arrives while I have other unread chats, the watch gets flooded — it seems to receive notifications for the old unread chats too, not just the new one. It looks like Telegram rebuilds/reposts the notification group (bundled notifications) whenever a new message comes in, and the app forwards all of them as if they were new.
I’ve already tried:
Turning off “Allow duplicate notifications”
The spam is still happening. Someone in the Discord mentioned another person had a similar issue — is this a known bug? Is there any way to fix or work around this?
Environment:
Pebble Time (2015), firmware v4.4.3-rbl
Mobile app version: 1.5.0.2
Android version: 17