Support › General › RWMB_Walker_Input_List issue fixResolved
In your class RWMB_Walker_Input_List you have value sanitization, like esc_html( $object->label ), but in this case, all html breaks, like the documentation example of using dashicons in button_group field type.
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We've noticed this issue and it has been fixed on this commit. Please update the new version of Meta Box 5.3.10 to get updates.