Tab groups starting with extra new tabs when group sync is off

[AviKohn7]

Short description

When I close the browser then reopen it, my tab groups fill with new tabs

Steps to reproduce

1. Start browser with clean profile
2. Install Tab Session Manager
3. Install Save Tab Groups For Tab Session Manager
4. Sign in to a new google account
5. Turn off group tab sync (warning: will delete any current tab groups)
   • Settings -> Sync and Google Services -> Manage what you sync -> Customize Sync -> Turn off tab groups
6. Open some tab groups
7. Save session
8. Close browser
9. Open browser, press ctrl+shift+t

Expected result

Your previous session comes back up (through google's default session restoration)

Actual result

Any tab groups that you have (given n tabs in the group) will start with n new tabs and then the actual tabs

Platform information

• Platform (OS): Windows
• Version of browser: 131.0.6778.265
• Version of Tab Session Manager: 7.0.1

Additional context

I tested this on a new browser with the above steps and was able to reproduce it, then I disabled tab session manager + group (which interestingly deleted all of my tab groups), closed the browser, reopened it, re-enabled tab session manager + group and it fixed the issue. I was not able to reproduce this on my normal profile though.
Edit: I've found some success by manually deleting each tab group then reopening the session, but it didn't work permanently