i'm up to date and i have the same error
react-dom.min.js?ver=16.13.1:125 TypeError: this.$input.data(...).map is not a function
at i.loadInitialAttachments (media.js?ver=5.3.6:148)
at initialize (media.js?ver=5.3.6:126)
at i.h.View (backbone.min.js?ver=1.4.0:2)
at i [as constructor] (backbone.min.js?ver=1.4.0:2)
at new i (backbone.min.js?ver=1.4.0:2)
at HTMLInputElement.initImageField (image-advanced.js?ver=5.3.6:37)
at Function.each (load-scripts.php?c=1&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.6:2)
at s.fn.init.each (load-scripts.php?c=1&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.6:2)
at HTMLDocument.init (image-advanced.js?ver=5.3.6:45)
at HTMLDocument.dispatch (load-scripts.php?c=1&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.6:2)
May be a regression ?