Error when trying to access stack outputs

The docs say that you can output values from parent stacks to be read by dependent stacks. I’m looking at this page:

The output works fine, but when I try to ingest a value in another stack using this format:


I get an error from the parser:

Invalid variable reference syntax for variable output:my_service.VpcId. You can only reference env vars, options, & files. You can check our docs for more info.

Am I missing something or is this a bug? Seems odd that I would be the only one experiencing this.

Stupid move on my part. I was still on v1.51.