Selecting text in Messages using Big Sur

Has anyone noticed that using Messages with Big Sur is a bit more difficult than past OS's? When I type a message and want to either copy/cut/delete something I've already written, I'm unable to press shift + left/right/up/down arrows to select the text. I'm forced to use my mouse to click and highlight the text which is very annoying and feels like I'm hitting a speed bump every time. I'm fully able to select text using the shift + arrow keys in any other application or browser, it's just Messages that's causing me problems. Has anyone had this issue or know how to fix it?