Mermaid Flow Chart does not render and also breaks subsequent diagrams

[besi]

Hello there. I am using The current test version of MacDown 0.8.0d71 (1079).
I'm trying to include a flowchart diagram in Macdown which does not work unfortunately:

First I thought that this might be a version issue but it seems that flow charts are there since the very beginning in 2014:
https://github.com/mermaid-js/mermaid/releases/tag/0.1.0

GitHub

Release Initial version · mermaid-js/mermaid

Support for graph definition scripting and rendering of flowcharts Documentation:

Description of syntax and usage in Readme.md