Modify $profileDir/AdBlockState file to toggle the list’s allow-attribution-tracker-rules state to true.
Start the browser again.
Disable and re-enable the blocklist source to apply. You can confirm by opening the AdBlockState file and seeing that the list now has 0 unsupported rules.
Testing notes:
Close all tabs from this domain, or restart the browser between each test to ensure states don’t persists! Do not reopen a closed tab as states may persist in its session.