WordPress uses url different from defined in rewrite arg of custom post type

Try setting your ‘rewrite’ in the CPT to:

'rewrite' => false,

save permalinks.
check frontside of site to ensure it worked. (if it doesn’t you may have a duplicate code somewhere…)

then set it back to:

'rewrite' => (
    'slug' => 'banaan',
    'with_front' => false,
),

flush permalinks again.
Smile (hopefully)

Why have you elected to use brackets instead of parentheses? You might try using the traditional method.

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