Long-term browser settings disappear after low storage

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Description of the issue: Settings disappear after low disk space, including search engines & sync chain gone.

If just session data were lost, I could understand, but perhaps more permanent data should live in more permanent files, not subject to disappearing, presumably, on failed file writes.
How can this issue be reproduced? (speculative, guessing)

  1. Open Brave, fill the disk.
  2. Open tabs, continue activity so more writes from brave are triggered. Trigger sync?
  3. Close (or kill), free space, & reopen.

Expected result: Long-term settings are still present. Sync can continue, search engines are still present.

Brave Version( check About Brave): 1.71.123 Chromium: 130.0.6723.116 (Official Build) (64-bit)

Additional Information:

I have control of the Sync chain from my phone, to resync, but I can’t successfully “Leave Sync Chain” on my desktop/laptop to attempt.

If settings have disappeared, aren’t available on my laptop, I worry about resetting my phone to follow the laptop’s sync chain (event though they should be the same). Additionally, I removed 6 instances of the laptop from the chain via my phone. Possibly an issue with the laptop browser–not being properly shut down, but not resilient to the issue either.

Even built-in search settings disappeared.

Broken profile

Fresh profile

Settings came back after deleting sync chain and 1 or 2 relaunches.

I tried deleting the sync chain, then I should’ve relaunched, but add another profile to get around sync chain “denied by administrator” status during the launch that I successfully left the sync chain. Resolved.