error during decryption with ML-KEM-768+X25519

[falko-strenzke]

on current master:

• creating a key (25) (ML-DSA-65 + Ed25519) + (ML-KEM-768 + X25519)
• encrypting a file ./src/rnp/rnp --encrypt --sign -r 8f79c8e978cc1793 --armor Makefile
• then decrypting it causes an error

❯ ./src/rnp/rnp --decrypt Makefile.asc 
File 'Makefile' already exists. Would you like to overwrite it? (y/N) N
Please enter the new filename: test-decr
[parse_material() /home/fstrenzke/dev/tb_pqc/rnp/src/librepgp/stream-packet.cpp:1297] failed to get kyber-ecdh session key
[encrypted_read_packet_data() /home/fstrenzke/dev/tb_pqc/rnp/src/librepgp/stream-parse.cpp:2221] Failed to parse PKESK, skipping.
[init_encrypted_src() /home/fstrenzke/dev/tb_pqc/rnp/src/librepgp/stream-parse.cpp:2499] failed to obtain decrypting key or password