Hi! I faced the same problem, and it was worst as my eshop has two languages (similar to this case mentioned in WPML forum). It definately happens after updating to WooCommerce 3.6.1. The YITH WooCommerce Ajax Product Filters for categories and attributes are missing/misbehaving.
The two actions which saved me after spending two days to solve this:
1) after updating to woocommerce 6.3.1, you must update the woo database !!!
Then the categories filter appears, but maybe not hierarchically.
2) try to edit (make a small change) to a published product (both to it’s body and attributes) and save it.
Another workarounds didn’t work for me or where temporal (eg Regenerate the product attributes lookup table).
PS. @bestpresents I would suggest to rename this thread to “YITH WooCommerce Ajax Product Filter doesn’t work with woocommerce 6.3.1” to help other people find it.
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This reply was modified 2 years, 8 months ago by arisr.
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This reply was modified 2 years, 8 months ago by arisr.