When I have several SQLs in one file, each ends with ";" and I click into one of them and "execute current statement" (using shortcut Ctrl-F8) - the SQL is highlighted with light blue background and the data is shown. Now when I want to refresh the data using the "refresh result set", after clicking on the circle-arrow button - all other SQLs are deleted from my file/screen.

This is indeed not correct. We'll fix it.

Note that you can recover the SQL text by using the "Previous SQL" button next to the SQL Window (Ctrl-Up key).

Yes, also stumbled across this today. No fun. Please fix it soon.

Seems fixed in version 13.0.2.1898