Fix fatal error triggered by `?taxonomy[]=term` URLs for hierarchical taxonomies

[pierre-dekode]

When accessing a URL with a taxonomy slug URL parameter using array format (such as ?product_cat[]=accessories), a fatal error is triggered if the related taxonomy rewrite is hierarchical. For example, visiting the default WooCommerce /shop page with multiple product_cat[]=… query args will trigger this error.

Trac ticket: https://core.trac.wordpress.org/ticket/57300

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[L-X-T]

Hey @pierre-dekode, love your solution for this. Let's hope this PR will be merged soon.

[L-X-T]

Why is there still no progress? I need to manually fix this after every WP update which is kind of annoying :-(

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