It seems that we increment retries for every loop iteration, even if the callback succeeded and there were no errors from the TG API:

Lines 149 to 150 in c062712

	finally:
	retries += 1

This conflicts with the logic of checking the number of retries done:

Lines 131 to 135 in c062712

	except TelegramError as telegram_exc:
	if on_err_cb:
	on_err_cb(telegram_exc)

	if max_retries < 0 or retries < max_retries:

It also seems that we don't reset retries = 0 when there are no errors returned.