This was noticed again when @neb_alertmanager:matrix.org was trying to join a room on 2021-12-01 14:08:56 with ID containing TZrnFfySWI after being invited by @jaywink.

Relevant stack trace:

Stack trace

2021-12-01 14:08:56,850 - synapse.http.server - 101 - ERROR - PUT-2311876 - Failed handle request via 'RoomSendEventRestServlet': <XForwardedForRequest at 0x7fe7a53f3bd8 method='PUT' uri='/_matrix/client/r0/rooms/%21redacted:federator.dev/send/m.room.message/go1638367736821254338?access_token=<redacted>' clientproto='HTTP/1.1' site='8138'>
Capture point (most recent call last):
  File "/usr/local/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/synapse/src/synapse/app/generic_worker.py", line 508, in <module>
    start(sys.argv[1:])
  File "/home/synapse/src/synapse/app/generic_worker.py", line 503, in start
    _base.start_worker_reactor("synapse-generic-worker", config)
  File "/home/synapse/src/synapse/app/_base.py", line 125, in start_worker_reactor
    run_command=run_command,
  File "/home/synapse/src/synapse/app/_base.py", line 177, in start_reactor
    run()
  File "/home/synapse/src/synapse/app/_base.py", line 161, in run
    run_command()
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/base.py", line 1318, in run
    self.mainLoop()
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/base.py", line 1328, in mainLoop
    reactorBaseSelf.runUntilCurrent()
  File "/home/synapse/src/synapse/metrics/__init__.py", line 645, in f
    ret = func(*args, **kwargs)
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/base.py", line 967, in runUntilCurrent
    f(*a, **kw)
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/defer.py", line 662, in callback
    self._startRunCallbacks(result)
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/defer.py", line 764, in _startRunCallbacks
    self._runCallbacks()
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/defer.py", line 859, in _runCallbacks
    current.result, *args, **kwargs
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/defer.py", line 1751, in gotResult
    current_context.run(_inlineCallbacks, r, gen, status)
Traceback (most recent call last):
  File "/home/synapse/env-py37/lib/python3.7/site-packages/twisted/internet/defer.py", line 1661, in _inlineCallbacks
    result = current_context.run(gen.send, result)
  File "/home/synapse/src/synapse/rest/client/room.py", line 272, in on_POST
    requester, event_dict, txn_id=txn_id
  File "/home/synapse/src/synapse/handlers/message.py", line 858, in create_and_send_nonmember_event
    depth=depth,
  File "/home/synapse/src/synapse/handlers/message.py", line 615, in create_event
    depth=depth,
  File "/home/synapse/src/synapse/util/metrics.py", line 106, in measured_func
    r = await func(self, *args, **kwargs)
  File "/home/synapse/src/synapse/handlers/message.py", line 959, in create_new_client_event
    ), "Attempting to create an event with no prev_events"
AssertionError: Attempting to create an event with no prev_events
2021-12-01 14:08:56,872 - synapse.access.http.8138 - 421 - INFO - PUT-2311876 - x.x.x.x - 8138 - {@neb_alertmanager:matrix.org} Processed request: 0.029sec/0.007sec (0.015sec, 0.000sec) (0.001sec/0.006sec/3) 55B 500 "PUT /_matrix/client/r0/rooms/%21redacted:federator.dev/send/m.room.message/go1638367736821254338?access_token=<redacted> HTTP/1.1" "Go-http-client/2.0" [0 dbevts]

Uh oh!

lots of AssertionError: 'Attempting to create an event with no prev_events' #8094

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