startBot is invoked even if the 'startgroup' deeplink doesn't carry any 'parameter'

[RememberTheAir]

Steps to reproduce

1. click on a startgroup deeplink with an admin parameter and with empty startgroup parameter
2. select a group where to add the bot as admin
3. add the bot

Expected behaviour

messages.startBot is not invoked

Actual behaviour

messages.startBot is invoked, and /start@botusername is sent to the group

According to https://core.telegram.org/api/links#group-channel-bot-links:

• t.me/<bot_username>?startgroup=customarg&admin=<permissions> should send a /start command in the group (works correctly)
• t.me/<bot_username>?startgroup&admin=<permissions> should not send a /start message in the group after the bot is added (tdesktop sends it (bug), Telegram for Android doesn't (correct behavior))

Note: startgroup deeplinks without an admin parameter behave as expected

Operating system

Any

Version of Telegram Desktop

6.3.1

Installation source

Static binary from official website

Crash ID

No response

Logs