Due to the high priority of 100 of the plantuml extensions it does not work with the snippets extension which registers with a priority of 32.
Currently the plantuml extension processes the Snippets Notation as plantuml within fenced code blocks, instead of having snippets first be replaced.
e.g.
```plantuml
--8<-- "my-plantuml.puml"
```
will render as
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