This is what seems to be the same issue that seemed to have occurred before in that the selling_plan_groups array is empty in Liquid. Many merchants have reached out regarding this. I can provide specific examples if needed to a Shopify representative to not expose sensitive details here.
Hey. I have not personally contacted support other than through here. I know some merchants reached out to your support but basically got the response to “contact the app developer”. As mentioned I can message you a specific example if needed.