Upgrading to Bitcoin Core version 28.0 at coinos.io resulted in lengthy rescans causing approximately 30 minutes of downtime.Around 200 watch-only descriptor wallets were loaded at startup, each undergoing a 30-40s rescan as the node rebooted.During the rescans, the node became unresponsive to other RPC calls.Attempts to abort the rescans using 'bitcoin-cli -rpcwallet=<wallet id> abortrescan' were unsuccessful.