I'm seeing the same results for select all (ctrl + a), on Windows 10 with 20201109-553d4e12e9-win_x86-devprev. I get different results when I only select all or part of a recipe using click and drag.
In the Foldit recipe editor, when I select all (ctrl + a) then cut (ctrl + x), not everything disappears from the screen, as Bruno states.
When I paste the copied or cut text into another editor, there are no carriage return/line feeds or new lines, or any sort of line separator. The text is illegible. When I paste into the vim text editor, the recipe appears as one long line.
With select all, both copy and cut transfer the entire recipe, but both methods remove the line separators.
The new release also makes it possible to select all or part of the recipe using the mouse. In the Foldit recipe editor, left click and drag to make a partial selection.
For a partial selection with click and drag, cutting seems to remove the entire selection, with nothing left over. Selecting the entire recipe with click and drag, then cutting, leaves some text on the screen.
When copying or cutting a click and drag selection in Foldit, then pasting into another editor, you do get line separators. Unfortunately, they are just single carriage returns (0x0D). In vim, they show up as "^M". (It's possible to fix this in vim, see LSB on the wiki.)
Somewhat surprisingly, Windows Notepad handles the 0x0Ds intelligently, so the pasted text looks correct. When you save the results in Notepad, the resulting file has carriage return/line feed (0x0D0A) delimiters.
In the other direction, copying or cutting from an external editor and pasting into the Foldit editor seems to work correctly. As usual, there are little square boxes (LSB), but they don't affect the operation of the recipe.
The issues with carriage return/line feeds (0x0D0A) versus newlines (0x0A) as line delimiters is yet another case of Windows versus the rest of the world. It's been an irritation in Foldit for a long time. It would be nice if Foldit were as smart as Windows Notepad when it comes to these delimiters (and maybe tab characters, too).