I saw this message this morning. Updated everything to latest version including WP to 6.2. Site immediately broke, with all products showing as "out of stock" regardless of actual stock status. Isolated the issue to either ATUM Product Levels or the main ATUM Inventory Management for WooCommerce. When those plugins are deactivated, site functions again.
I restored site from backup 12 hours old, losing some order data, because I don't know how to roll back update to individual plugins: all or nothing. Meanwhile, I have disabled auto-updates for the ATUM plugins pending investigation/patch. Can one of you devs login to our site to troubleshoot? Or what further info do you require to help?