Fix parsing crash for update in later phases

[bracevac]

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Fixes #23389

[bracevac]

@odersky I'm not quite sure I understand why the Feature.ccEnabled check fails in subsequent phases inside modOfToken. If I test this with erased, it seems to work no problem.

[odersky]

The ccEnabled test asks whether it's enabled for the current compilationUnit. Is that set correctly for rendering? That's where I would look.

[odersky]

In fact, no, the compilation unit is "<highlighting>"