Problem with forms in V8

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Hi everyone, so I have installed new C5 v8 (the latest version), and I use forms block on my website. I have few problems here:

1. I need to add selection field with 200+ Countries, and I see no possibility to copy - paste list, because after each value I have to click "save"...? I can see in Legacy Form there is option in selections that "add list with new value in each line" which makes it possible to copy-paste list. But what if I don't want to use legacy forms, I want to use latest forms?

2. I have built a form while ago as a stack because I used in several places on my website, but now I am unable to edit it - it just "loading..." forever. The only solution is to delete and add a new one. Is there another solution to make this editable again? P.S., this happened for me for a few times before as well, and only if I use stack elements... Is this a bug? I use latest chrome browser with incognito mode. Any ideas?