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edpt_xfer() restored EP0 to CONTROL at the top of the function, before the OUT stage was armed (rx bufsize + STAT_RX=VALID written further down, with interrupts enabled in between). That re-enabled the CH32 blind OUT ACK while STAT_RX was still NAK and the buffer size stale, so a host-retried DATA OUT / status ZLP could be ACKed into the wrong buffer in the gap. Fold the CONTROL restore into the single exclusive write that programs STAT_RX=VALID for the OUT direction, after the buffer size is set, so type and arming go live together. The IN direction keeps the (now atomic) early restore, where no pending OUT exists to be blind-ACKed. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>