I think I’ve found the cause of the issue, in at least my situation.
Line 245 of input-v5.js:
p.data = $.parseJSON( decodeURIComponent( val.replace(/\+/g, '%20') ) );
In the event that a value is present, but cannot be parsed into JSON the field breaks. For me, this occurred when I changed an existing field to a table field, and it already contained a value. Removing this incompatible value solved the issue for me.
