No E-Mail sent after order status update – cron fail

Hi there

Great plugin! I use it to change from the status “completed” to a custom order status “billed” which also should send out an E-Mail containing a QR-bill and the billing information. This worked great until some days. Now the status changes but no E-Mail gets sent out.

Also I receive messages from the plugin “WP Cron Status” that say that the following cron failed: “alg_wc_order_status_rules_process_rules”

See screenshot: https://nimb.ws/D1pRBw3

Any ideas why this is not working any more and how to make it work again? Some days before I changed to High-Performance Order Storage (HPOS). Can this might cause the problem?

Thanks in advance for your help!

Best,
Fletsch