OCRbot broken after Mastodon 3.4.0 upgrade

I had an instance of OCR bot running and then upgraded my Mastodon instance from 3.3.0 to 3.4.0. OCRbot immediately stopped working. The Mastodon instance works fine, and other bots that do things like post RSS feeds are working fine. Here is the error message I get:

$ /home/ocrbot/ocrbot/OCRbot/service.py
Logging in...
Using Tesseract (sh)
Available languages: eng
Starting OCRbot.
Traceback (most recent call last):
File "/home/ocrbot/ocrbot/OCRbot/service.py", line 314, in
client.stream_user(rl) #go!
File "/home/ocrbot/.local/lib/python3.8/site-packages/decorator.py", line 232, in fun
return caller(func, *(extras + args), **kw)
File "/home/ocrbot/.local/lib/python3.8/site-packages/mastodon/Mastodon.py", line 102, in wrapper
return function(self, *args, **kwargs)
File "/home/ocrbot/.local/lib/python3.8/site-packages/mastodon/Mastodon.py", line 3110, in stream_user
return self.__stream('/api/v1/streaming/user', listener, run_async=run_async, timeout=timeout, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
File "/home/ocrbot/.local/lib/python3.8/site-packages/mastodon/Mastodon.py", line 3626, in __stream
connection = connect_func()
File "/home/ocrbot/.local/lib/python3.8/site-packages/mastodon/Mastodon.py", line 3553, in connect_func
raise MastodonNetworkError("Could not connect to streaming server: %s" % connection.reason)
mastodon.Mastodon.MastodonNetworkError: Could not connect to streaming server: Internal Server Error

Start at OCRbot/service.py line 314, where client.stream_user(rl) invokes the Mastodon streaming connection. Reproduce the failure against Mastodon 3.4.0 and inspect the mastodon Python client's stream_user implementation and endpoint handling. Done means OCRbot starts streaming user events without the reported MastodonNetworkError.