Steps to reproduce:

* Build with `integer` sanitizer
* `UBSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1" ./src/qt/bitcoin-qt`
* Enter into the RPC debug console: `decodepsbt "cHNidP8BAKOro2MDAwMDA5ggCAAA////CQAtAAD+///1AAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAJAAAAAAAAAAAAAAAAAAAAAAAAAD+///1Zm9ybmV3nWx1Y2vmelLmegAAAAAAAAAAAAAAAAAAAAMKAwMDAwMDAwMDAwMACvMBA3FkAAAAAAAAAAAABAAlAAAAAAAAACEWDQ0zDQ0NDQ0NDQ0NCwEAAH9/f39/fwMAAABNo6P///kAAA=="`
Unserialize(s);
    }
};
struct PartiallySignedTransaction
{
    std::optional<CMutableTransaction> tx;
    
    
    std::map<KeyOriginInfo, std::set<CExtPubKey>> m_xpubs;
    std::vector<PSBTInput> inputs;
    std::vector<PSBTOutput> outputs;
    std::map<std::vector<unsigned char>, std::vector<unsigned char>> unknown;
    std::optional<uint32_t> m_version;
    std::set<PSBTProprietary> m_proprietary;
    bool IsNull() const;
    uint32_t GetVersion() const;
    /** Merge psbt into this. The two psbts must have the same underlying CTransaction (i.e. the
      * same actual Bitcoin transaction.) Returns true if the merge succeeded, false otherwise. */
    [[nodiscard]] bool Merge(const PartiallySignedTransaction& psbt);
    bool AddInput(const CTxIn& txin, PSBTInput& psbtin);
    bool AddOutput(const CTxOut& txout, const PSBTOutput& psbtout);
    PartiallySignedTransaction() {}