Created attachment 175668 [details]
Text wrongly appended to the end
Editing a cell containing an email address from the formula bar corrupts it.
The corruption is somewhat random regarding if the new text is added in the middle or in the beginning.
I attach two videos of what happens.
This bug exists from several major versions.
Created attachment 175669 [details]
Cells gets cleared
Because it's interpreted as a hyperlink, you can use [Ctrl+K] or Menu/Insert/Hyperlink to edit as you like.
*** This bug has been marked as a duplicate of bug 72266 ***