Describe the bug
Some of our deployments are facing an issue with yaml anchors. That fails the deployment at the very beginning while loading the manifest yaml with:

D, [2022-06-06T01:38:32.096112 #5838] [task:300244] DEBUG -- DirectorJobRunner: (0.000564s) (conn: 4320) BEGIN
D, [2022-06-06T01:38:32.097385 #5838] [task:300244] DEBUG -- DirectorJobRunner: (0.000708s) (conn: 4320) UPDATE "tasks" SET "event_output" = ("event_output" || '{"time":1654479512,"error":{"code":100,"message":"Unknown alias: ref_0"}}') WHERE ("id" = 300244)

Our current expectation is that

To Reproduce
This issue can be reproduced by creating a deployment via REST API and providing a deployment manifest that uses yaml anchors.

Here a manifest snippet:

stemcell-alias: &cell-alias "ubuntu"
stemcells:
- alias: *cell-alias
  os: "ubuntu-bionic"
  version: "latest"

And the REST API invocation:

bosh -e bosh curl -X POST /deployments -H 'Content-Type: text/yaml' --body=service-fabrik-mongodb.yml

We expect that this issue was introduces with v272.1.0

Additional context
To mitigate the problem we rolled back to our last known good bosh version v271.16.0