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I located the setup video instructions on YouTube . At approximately 30:29–35:27, the presenter explicitly explains that W0–W4_WALLET_TO_ADDRESS are change-return addresses and warns that leaving the placeholder causes the entire remaining UTXO to be sent to somebody else.
This exactly matches my transactions: approximately 9.996066 KAS and 29.998028 KAS were routed to the placeholder, while only tiny L1 fees were actually charged.
My configuration is now corrected. Please ask the developers who generated or controls the placeholder address and whether its private key is available to return the 39.994094 KAS.