Running a migration plan from vCenter VMware 7.0.3 to OCP (VM - mtv-func-rhel8-ameen) with Pre-hook while trying to verify this issue:
MTV-2894

It failed on pre-hook phase couple of times

Job has reached the specified backoff limit

Found 2 pods, using pod/plan-vmware-vm-1001-prehook-48kwp-mph25 [WARNING]: No inventory was parsed, only implicit localhost is available [WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match 'all' ERROR! A playbook must be a list of plays, got a <class 'ansible.parsing.yaml.objects.AnsibleUnicode'> instead The error appears to be in '/tmp/hook/playbook.yml': line 1, column 1, but may be elsewhere in the file depending on the exact syntax problem. The offending line appears to be: LS0tCi0gbmFtZTogTWFpbgogIGhvc3RzOiBsb2NhbGhvc3QKICB0YXNrczoKICAtIG5hbWU6IExvYWQgUGxhbgogICAgaW5jbHVkZV92YXJzOgogICAgICBmaWxlOiBwbGFuLnltbAogICAgICBuYW1lOiBwbGFuCiAgLSBuYW1lOiBMb2FkIFdvcmtsb2FkCiAgICBpbmNsdWRlX3ZhcnM6CiAgICAgIGZpbGU6IHdvcmtsb2FkLnltbAogICAgICBuYW1lOiB3b3JrbG9hZA== ^ here

---
- name: Main
  hosts: localhost
  tasks:
  - name: Load Plan
    include_vars:
      file: plan.yml
      name: plan
  - name: Load Workload
    include_vars:
      file: workload.yml
      name: workload

OCP: 4.19.9
MTV: 2.10.0 - redhat-osbs-on-pr-dc82e426f3888f16a5752b78d6f9c4a8736808f9
CNV: 4.19.5

Always / N%

1. Create migration plan from vCenter 7.0.3 with VM 'mtv-func-rhel8-ameen'
2. add pre-hook to the plan
3. run the plan

Job has reached the specified backoff limit

Migration succeeds

The issue is the UI encode the Ansible playbook double times and it causes this issue