select_utxos took the first coin covering the amount, so 10 + 1 PLM and a 10 PLM bet was refused with balance_leaves_no_change and a 10 PLM withdrawal was reduced. User txs now ask for target + DUST_LIMIT_SATS; the old outcome is kept only when no allowed combination leaves change. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>