Setup：

• polkadot-launch
• 1 relay chain: polkadot-0.9.18 rococo
• 2 parachains: moonbeam-0.24.0 moonbase-local
  • Chain A paraId 1000
  • Chain B paraId 1001
• open hrmp channel via polkadot-launch
• sudo.slots.forceLease set long enough lease period

A external XC-20 ← B native token

A native token → B external XC-20