LifterLMS 6.0 now allows you to use the block editor to create certificates. However, the old certificates(which will be called legacy certificates as soon as you update to LifterLMS 6.0) would still work as they should. It would just have an added wording to it called -Legacy as shown in the screenshot below:
Let us know if you have any questions about LifterLMS 6.0 or any of the certificate and achievement features by contacting us here. We’d be happy to let you know any more specific info for your LifterLMS website.