bug#32315:

[Carlos Pita]

Here is a workaround:

(advice-add 'comint-send-input
            :around (lambda (f &rest args)
                      (when (eq major-mode 'inferior-python-mode)
                        (cl-letf (((symbol-function 'g)
                                   (symbol-function 'add-text-properties))
                                  ((symbol-function 'add-text-properties)
                                   (lambda (start end properties
&optional object)
                                     (unless (eq (nth 3 properties)
'comint-highlight-input)
                                       (g start end properties object)))))
                          (apply f args)))))