Inconsistent behavior of 'name' argument in code-block directive

[rossbar]

Describe the bug
From limited testing, it appears that the name: argument requires a string to work within the {code-block} directive. This is inconsistent with how name: appears to work within other directives such as {figure} or {table}, for instance.

To Reproduce
The following works for creating a label called fig:my that can then be used in the text via the {ref} or {numref} roles. This works with the table directive as well.

​```{figure} my_figure.png
---
name: fig:my
---
​```

However, the following fails to define a label (a sphinx warning about an undefined label is raised if you try to reference code:my in the document):

​```{code-block} python
---
name: code:my
---
def my_fun(): pass
​```

The following works however (note the quotes around the label name):

​```{code-block} python
---
name: 'code:my'
---
def my_fun(): pass
​```

Expected behavior

I am not a sphinx/docutils expert, so maybe this is the expected behavior. However I would expect the name: argument to result in consistent behavior within all directives for which it is defined.

Screenshots
n/a

Environment (please complete the following information):

• Python Version: 3.8.1
• Package Version: myst_parser@4150051

[rossbar]

NVM - the issue I reported is incorrect. The caption: must be defined as well within the code-block for the name: to work.

[chrisjsewell]

Always happy when an issue gets closed before I’ve even looked at it 😆

[rossbar]

I'm getting a little trigger happy 😨