Passwords saved on Desktop before joining the sync are self-removed from Android when Android device is deleted from the sync chain

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Description

Passwords saved on Desktop before joining the sync are self-removed from Android when the Android device is removed from the sync chain or when the whole sync chain is deleted. If just the Desktop device is removed from the sync chain, passwords are not self-removed on the Android device since the sync chain still exists on that device.

Steps to reproduce

1. Launch the latest version of Brave on Desktop
2. Go to Settings > Sync > Create new or use existing sync chain
3. Make sure that Sync everything is ON to sync passwords
4. Go to any website where you can sign in to the account and save login credentials, for example, https://adobe.com
5. Save login credentials when prompted
6. Go to the Settings > Password manager > Confirm that the password is saved
7. Launch Brave with Cr131 on Android (I used Brave 1.73.100)
8. Go to the Settings > Sync > Confirm that the Sync is OFF
9. Close the settings > Go to any website where you can sign in to the account and save login credentials, for example, https://feedly.com
10. Save login credentials when prompted
11. Go to the Settings > Password manager > Confirm that the password is saved
12. Add Android device to an existing sync chain
13. Tap Sync everything to sync passwords
14. Go to the Password Manager on both devices > Confirm that all passwords are synced across all devices
15. Remove Android device from the Sync chain or Delete whole Sync chain on any of these devices
16. Go to Password manager > Observe that the passwords that were created on Desktop are removed from Android now
17. Upgrade Brave on Android to a newer version with Cr132
18. Repeat steps 7 - 16 > Observe that the upgrade didn't resolve the issue

Actual result

Passwords saved on Desktop before joining the sync are self-removed from Android when the Android device is deleted from the sync chain.

This issue is reproducible with Cr131 and Cr132.

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2025-01-14_15-18-08.mp4

Expected result

Passwords must not disappear if the device is removed from the sync chain or if the sync chain is deleted.

Reproduces how often

Easily reproduced

Brave version

Brave build: 1.76.13
Chromium: 132.0.6834.83 (Official Build) canary (64-bit)

Device

• Brand/Model: ANY
• Android version: 14, 15

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

No response