DeprecationWarning appears

[domingoUnican]

Dear all,
After running sage-shell:run-sage, the following warning appear in the console:
DeprecationWarning: There is no current event loop return get_event_loop().run_until_complete(self._dumb_prompt(self.message))
Then, the terminal does not work correctly, i.e. I can't type correctly, it freezes randomly, etc.
I am on a Fedora 33, emacs 27.2 and sage-shell-mode 20201225.1011 from melpa.