Cannot migrate VM from 7.5/7.6 to 8.2 INTERNAL_ERROR

[Meth0d]

I am trying to move some VMs to new hosts in order to get rid of the old 7.5/7.6 hosts.
I understand that you cannot migrate from 8.2 to lower Versions but from 7.X to 8.2 should work right?

After running for some time, the migration job fails with:

vm.migrate
{
  "vm": "a1155503-64fc-e24e-9905-f89616bde68b",
  "mapVifsNetworks": {
    "8fa70627-5d77-fe8d-0c1d-30b4370455ab": "4fcdc948-bf88-54d3-b2b3-93fb64702dfe"
  },
  "migrationNetwork": "4fcdc948-bf88-54d3-b2b3-93fb64702dfe",
  "sr": "bcf3c314-9137-9e84-9f75-6a35f0bb9db2",
  "targetHost": "3a625714-3193-475c-bd25-6de5a95e31b5"
}
{
  "code": 21,
  "data": {
    "objectId": "a1155503-64fc-e24e-9905-f89616bde68b",
    "code": "INTERNAL_ERROR"
  },
  "message": "operation failed",
  "name": "XoError",
  "stack": "XoError: operation failed
    at factory (/opt/xen-orchestra/packages/xo-common/src/api-errors.js:21:32)
    at /opt/xen-orchestra/packages/xo-server/src/api/vm.js:487:15
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at runNextTicks (internal/process/task_queues.js:62:3)
    at processImmediate (internal/timers.js:434:9)
    at Object.migrate (/opt/xen-orchestra/packages/xo-server/src/api/vm.js:474:3)
    at Api.callApiMethod (/opt/xen-orchestra/packages/xo-server/src/xo-mixins/api.js:304:20)"
}

[olivierlambert]

It might work, but it depends on various things (older the version, higher the chances it doesn't).

Double check you have the same amount of memory (dynamic min = dyn max = static max) before migrating.

[Meth0d]

Memory is set fixed:

Is this in any way tied to what management agent or guest OS this is ?

[Meth0d]

I can migrate this VM from another host (7.6) to the 8.2 host just fine:

Im not sure what the agent actually is, thats why im guessing this might be related

VM that fails: