The plugin LearnPress can work with the latest version of Meta Box, but not Meta Box AIO. The LearnPress's developer team uses Meta Box as a library but not update the Meta Box version in the plugin's source. You can see the old version of Meta Box in the file:
wp-content/plugins/learnpress/inc/libraries/meta-box/meta-box.php -- Version: 4.15.7
I will try to contact LearnPress's developer team to update the Meta Box version on their plugin.