Some proof requests are "unfullfillable"

[S1nus]

Figure out what caused this and

• rule out human error
• fix it if possible

[S1nus]

reproduce:

grpcurl -import-path $EQ_PROTO_DIR -proto eqservice.proto -d '{ "height": 4537373, "namespace": "yh3hKgOnKRB5Hw==", "commitment": "im1bKxUlDyJ5f4ayAt0vXiewiyOn+roNlU8gORujHCc=" }' -plaintext $EQ_SOCKET eqs.Inclusion.GetKeccakInclusion

stderr: WARNING: Using insecure random number generator.
stderr: thread '<unnamed>' panicked at program-keccak-inclusion/src/main.rs:38:24:
stderr: range end index 9 out of range for slice of length 6
stderr: stack backtrace:
stderr: note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.