When specifying "none" as the migration destination for the unnecessary NICs during migration, the migration works without any issues until version 4.10.x, but starting with version 4.11.0, the validation error occurs.
VMware HCX 4.11.0 and later versions
The specification has been changed since 4.11.0 to strictly check the mapping of the source and destination networks.
Either delete the unnecessary NICs beforehand or map all destination networks before migrations.