Copy all is not working within atom editor

In atom editor, I tried to copy all lines from a file using Ctrl + a and then pasting them in some other new file within atom editor. Its only pasting initial 249 lines from those lines, not all.
Then I selected all lines using mouse, copied it through menu and then tried to paste it in some other file within atom editor. Same result.

Then I copied a large number of lines from a file in some other editor and pasted in the same new file in atom editor. That worked.
I am using 1.49.0 x64 version.
What setting I need to correct in atom editor?

Oh, problem solved. Updated atom and problem solved.