I have upgraded from AC 1.71.5 to 1.72.4 just yesterday and find the redesign of the Parameter section in the ActionList Inspector almost impossible to use. Some issues are:
Apart from that, changing the parameter section to the same UI style like variables or menus and menu buttons (so that details for only one menu button at a time are visible), is a maximally unfortunate decision imho … it is absolutely essential to have all parameter details – especially the parameter's type! – of an action list "unfolded" and visible in one single view at all times to avoid mistakes.
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I am seeing more of this behavior when creating variables in bulk (tried with component variables):
I created 8 Variables in bulk, set them to integer, closed the scene, reopened it … and all but the first of the eight entries have reverted to untitled bools.
Thank you for your feedback and bug reports, I shall give them careful consideration.