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Fixes #5594

* Fix extraction

Otherwise, if you screw up a playlist test by including a playlist
dictionary key, you'll be there for eons while it downloads all the
files before erroring out.

vier.be and vijf.be run on the same CMS and are property of the same company,
so the same extractor can be used for both of them.

Thanks @spacemeowx2 for the algo.

Ref: https://gist.github.com/spacemeowx2/629b1d131bd7e240a7d28742048e80fc

Closes #12316

Due to causing out of sync issue