Lexing error in JupyterBook / R with reticulate

[hyanwong]

I have a JupyterBook with executable R content (it uses the R/Python reticulate library). I expect a cell to lead to an error, for example the following

ts$node(0)

Which gives the following error from the reticulate library:

Error in py_call_impl(callable, dots$args, dots$keywords): TypeError: Index must be of integer type, not 'float'

Traceback:

1. ts$node(0)
2. py_call_impl(callable, dots$args, dots$keywords)

However, even if I mark the cell with :tags: [raises-exception], I get a lex error (I assume when trying to format the error message)

WARNING: Could not lex literal_block as "ipythontb". Highlighting skipped.

Is there any way to tell JupyterBook not to bother trying to format the output?

This doesn't happen with :normal" R errors, so I wonder if there's something funky going on with the reticulate library?