After 10 hours of grueling testing and research the livestream community and I were able to confirm that there is only one way to safely extra multiple documents from a simple stream of YAML documents.
This StackExchange thread is fully with complete stupidity (as usual):
I’m totally blown away by the amount of shit on that platform. It’s a horrible tragedy that it pulls up in searches all the time. It really makes me want to make KEG again.