I don't know if this is something I did -probably not-, but I mention it since it may affect others running the unstable branch,
After a system update I got python-pip errors like this:
error: failed to commit transaction (conflicting files) python-pip: /usr/lib/python3.8/site-packages/pip/_internal/cli/__pycache__/progress_bars.cpython-38.pyc exists in filesystem
So, I decided to go to /lib/python3.8/site-packages/pip/ and delete all contents.
Running sudo pacman -Syyu after that completed the update without conflicts.