Hi, I have a simple flow that when I export to svg it only generates a black square. This is the flow: ```mermaid flowchart subgraph Gloeier1 gl1binin((GL1 BIN IN)) gl1[[Gloeier 1]] gl1binout((GL1 BIN OUT)) gl1binin -- start --> gl1 gl1 -- stop --> gl1binout end ``` this is the result exporting to svg: 