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I’m examining debug.log messages from a site running Nelio AB Testing, and this plugin is the only one trying to use this filter. Here’s the whole message:
[13-Dec-2019 04:39:01 UTC] woocommerce_product_gallery_attachment_ids is deprecated since version 3.0.0! Use woocommerce_product_get_gallery_image_ids instead.
The filter is used in woocommerce-support.php on line 92.