It's a case when a local node closes the channel unilaterally with broadcasting its local commitment transaction that contains
to_local output below. This output is spent by a transaction with nSequence field set to
to_self_delay (which can only be valid after that duration has passed.)
# Penalty transaction
It's a commitment transaction on Testnet as following.
"asm": "OP_IF 026644cb387614f66421d14da3596c21cffa239011416c9adf3f351ee8551a9fc7 OP_ELSE 144 OP_CHECKSEQUENCEVERIFY OP_DROP 029654f80732769d7c435a184a3559f12178315526c53bbf003349390811c7590a OP_ENDIF OP_CHECKSIG",
The commitment transaction got mined in
1356328 block height, and
144, so the output can be spent after it reaches
1356183 block height.