Filter doesn’t work anymore

As of yesterday the filter on the shop page doesn’t seem to work anymore. It seems to add the parameters in the link and filter but then removes the parameters again and shows all products. Before it worked like a charm for more than a year.

I have excluded the Advanced Ajax Filter plugin from my Async Javascript plugin a while a go to make it work and today cleared all cache from my WP Fastest Cache plugin and Cloudflare, together with the cache from the Advanced Ajax Filter pluging. Unfortunately without success.

Within the plugin I checked for errors and see errors since yesterday:
2021-11-24 05:05:55insert_table_braapf_variable_attributes
2021-11-24 05:05:55insert_table_braapf_variable_attributes
2021-11-24 05:05:54insert_table_braapf_product_stock_status_parent test
2021-11-24 05:05:54insert_table_braapf_product_stock_status_parent
2021-11-24 05:05:54insert_table_braapf_product_stock_status_parent test
2021-11-24 05:05:54insert_table_braapf_product_stock_status_parent
2021-11-24 05:05:54insert_table_braapf_product_stock_status_parent test
2021-11-24 05:05:54insert_table_braapf_product_stock_status_parent
2021-11-24 05:05:54Additional tables generation
2021-11-24 05:05:54Additional tables generation
2021-11-24 05:05:54Additional tables generation
2021-11-24 05:05:54Additional tables generation
2021-11-24 05:05:54Additional tables generation`

The last error before is from 2020-07-10 05:55:53.

Could anyone help with debugging and to make it work again for Black Friday sales? Really a bummer that exactly just before BF it doesn’t seems to work anymore.

Thanks!

The page I need help with: [log in to see the link]