Code Block without language option
[a={b=b}] will cause error.
2nd b will recognize as command.
I tried MDX Playground, but it seems working fine.

Hi @tamagoez did you figure out why it happens?
When I add markdown after ```, it worked.
When I use code block without any language, it will not show any code blocks, but plain text.
[a={b=b}] seems parsed as b=b(Javascript).
Thanks for the details, will keep this open and we can dig deeper in the future.
FYI, Code blocks without language is working for me in blog-theme v2.0.0-beta.13
closing since now it's works fine
