What were you trying to do that didn't work?
Get a prompt error from dst host hmp when do postcopy_preempt + tls migration:
qemu-kvm: Cannot read from TLS channel: The TLS connection was non-properly terminated

Please provide the package NVR for which bug is seen:
kernel-5.14.0-611.el9.x86_64 && qemu-kvm-9.1.0-26.el9.x86_64 && gnutls-3.8.3-9.el9.x86_64

How reproducible:
100%

Steps to reproduce
1. Configure tls environment
2. Boot a VM on the src host, also boot a VM with appending "-incoming defer" on the dst host
3. Enable postcopy and postcopy_preempt capabilities on src and dst host
4. Add TLS client and server:

{"execute": "object-add", "arguments":{"qom-type": "tls-creds-x509", "id": "tls0", "dir": "/etc/pki/qemu", "endpoint": "client", "verify-peer": true}, "id": "p2ORDILc"}

{"execute": "object-add", "arguments":{"qom-type": "tls-creds-x509", "id": "tls0", "dir": "/etc/pki/qemu", "endpoint": "server", "verify-peer": true}, "id": "84vCrk6C"}

5. Set TLS creds on src and dst host

{"execute": "migrate-set-parameters", "arguments":{"tls-creds": "tls0"}, "id": "YRHVic4I"}

6. Migrate VM from src to dst host
7. During migration is active, switch to postcopy

Expected results
Migration succeeds, VM works well on the dst host.

Actual results
Get a prompt error from dst host hmp when postcopy_preempt + tls migration converge:
qemu-kvm: Cannot read from TLS channel: The TLS connection was non-properly terminated

It's worth to mention that VM works well after migration, and don't hit any other errors from qmp/VM;
And if do vanilla postcopy migration, won't hit above prompt.