List of steps to reproduce (step by step, including full links if applicable):
Start editing an article using the standard wikitext editor. Then enable "new wikitext mode" in beta features and again start editing an article in the wikitext mode. Ensure that the syntax highlighting in both cases is turned on.

Compare the appearance.

What happens?:

Standard wikitext editor:

New wikitext editor:

Please notice that the new editor doesn't emphasize the section headings (== those ones ==) with a bigger font size, even though it used to do so. Moreover, no token is rendered in bold: subsection heading (=== these ===), bold text ('''lorem ipsum''') nor the template and parameter names.

The ≡ symbol in the subheading on the screenshots is just a way my font represents the sequence of three equal signs.

What should have happened instead?:
The syntax highlighting should be consistent between both wikitext editors.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:
The screenshots were taken on plwiki. Browser: Microsoft Edge (Chromium) v99.0.1150.55