Same here, i upgraded from 1.16.5 to 1.30, but had some sort of bug in sortable elements, or group elements.
QM show this error:
Undefined array key "clone_empty_start"
wp-content/plugins/wp-dd-metabox-aio/vendor/meta-box/meta-box-aio/vendor/meta-box/meta-box-group/group-field.php:219
I have some sortable elements into group and after updating meta-box-aio appear an "Element 0" in existing elements, and if i delete this element 0 after saving element 0 appear again.
So i need to revert MBAIO to previous version and i have to be able to do it in composer.
Best practice is to have version number into composer and not dev-master ....so everyone can handle versions.. i don't understand why i so difficult replate dev-master with version number...