Logitech k480 Bluetooth Keyboard. Copy and paste no longer works

I currently have a bluetooth Logitech k480 keyboard, paired to the following...

iPad (5th Generation) MP2JX/A

iPad OS 13.7

I used to be able to Copy and Paste text in most Apps (e.g Google Keep, Gmail, Zoho Mail, NextCloud) using the "fn" + "C" key to Copy, "fn" + "X" to cut and "fn" + "V" to paste.

At some point, in the recent month, this completely stopped working for me.

Have tired un-pairing and re-pairing the keyboard to my iPad, but still no joy.

Have tried searching around on the internet for solutions, but nothing has come up.