YAML safe_load prevents aliases

Puppet Version: current master, e.g. ddd5610aa9ffb5eb9da13521f1fc68e562a2e0b3
Puppet Server Version: n/a
OS Name/Version: n/a

Actual Behavior:

In some cases puppet creates a transactionstore.yaml that are not able to be read back, causing

Error: Transaction store file /home/david/.puppetlabs/opt/puppet/cache/devices/pavm/state/transactionstore.yaml is corrupt (Unknown alias: 1); replacing

Desired Behavior:

No errors or stacktraces on regular puppet use.

Reproduction:

thomas.franklin has put together a detailed description and a potential fix in https://github.com/Thomas-Franklin/puppet/commit/49b8e023c6c9bb551bd0ce21648a604042c490ff

The issue is also visible in the panos acceptance pipelines: https://jenkins-master-prod-1.delivery.puppetlabs.net/view/modules/view/networking/view/panos/view/master/job/forge-module_puppetlabs-panos_intn-sys_full-pe-future-master/8/