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
When returning the customRenderFn from within buildCustomMarkdownCookFunction for custom markdown engines (such as the one used by the [chat] transcripts) we were not hoisting/unhoisting the `html_raw` tokens created by the transcript, which meant that opts.discourse.hoisted could end up in a state where it was null, and which caused errors and general unpleasantness. Instead, we can just call the `cook` function that is already exported from discourse-markdown-it, that takes care of what we did previously plus the hoisting. There is a companion chat commit that adds tests for this, there are no custom markdown engine usages in core to test with.