If a selected file has its name clicked on, there's a intentional delay due to the possibility of a double-click from the user to open the file. However if the user immediately starts typing, it doesn't immediately go to "Renaming mode" with the already typed text, nor it includes the already typed text, which seems not intentional. This affects both the Desktop and Dolphin files/folders.
This is mostly noticeable when the user intentionally type random letters and press Enter when renaming files/folders.
It's also noticeable when using "Ctrl + V" to paste, "Ctrl + C" to copy, and "Ctrl + X" to cut.