Perspective raises error when trying to filter: ValueError: too many values to unpack (expected 3)

[MarcSkovMadsen]

Panel: 0.11.3

When trying to filter by dragging a field the Perspective Viewer raises an error.

perspective-error.mp4

import panel as pn
import pandas as pd

pn.extension("perspective", sizing_mode="stretch_width")

data = pd.DataFrame({
    "Curve": list(range(0,1000)),
    "Other": list(range(0,1000)),
    })
pn.pane.Perspective(data).servable()

$ panel serve 'examples\issue_perspective.py' --auto --show
2021-05-08 19:36:33,523 Starting Bokeh server version 2.3.1 (running on Tornado 6.1)
2021-05-08 19:36:33,525 User authentication hooks NOT provided (default user enabled)
2021-05-08 19:36:33,526 Bokeh app running at: http://localhost:5006/issue_perspective
2021-05-08 19:36:33,526 Starting Bokeh server with process id: 20144
2021-05-08 19:36:35,000 WebSocket connection opened
2021-05-08 19:36:35,001 ServerConnection created
2021-05-08 19:37:24,096 Exception in callback functools.partial(<bound method IOLoop._discard_future_result of <tornado.platform.asyncio.AsyncIOMainLoop object at 0x0000015F24436130>>, <Task finished name='Task-174' coro=<_needs_document_lock.<locals>._needs_document_lock_wrapper() done, defined at c:\repos\private\panel_docker\panel\.venv\lib\site-packages\bokeh\server\session.py:51> exception=ValueError('too many values to unpack 
(expected 3)')>)
Traceback (most recent call last):
  File "c:\repos\private\panel_docker\panel\.venv\lib\site-packages\tornado\ioloop.py", line 741, in _run_callback
    ret = callback()
  File "c:\repos\private\panel_docker\panel\.venv\lib\site-packages\tornado\ioloop.py", line 765, in _discard_future_result
    future.result()
  File "c:\repos\private\panel_docker\panel\.venv\lib\site-packages\bokeh\server\session.py", line 71, in _needs_document_lock_wrapper
    result = await result
  File "c:\repos\private\panel_docker\panel\.venv\lib\site-packages\tornado\gen.py", line 216, in wrapper
    result = ctx_run(func, *args, **kwargs)
  File "c:\repos\private\panel_docker\panel\panel\reactive.py", line 257, in _change_coroutine
    self._change_event(doc)
  File "c:\repos\private\panel_docker\panel\panel\reactive.py", line 267, in _change_event
    self._process_events(events)
  File "c:\repos\private\panel_docker\panel\panel\reactive.py", line 943, in _process_events
    super(ReactiveData, self)._process_events(events)
  File "c:\repos\private\panel_docker\panel\panel\reactive.py", line 250, in _process_events
    self.param.set_param(**self._process_property_change(events))
  File "c:\repos\private\panel_docker\panel\panel\pane\perspective.py", line 396, in _process_property_change
    msg['filters'] = [[self._as_digit(col), e, val] for col, e, val in msg['filters']]
  File "c:\repos\private\panel_docker\panel\panel\pane\perspective.py", line 396, in <listcomp>
    msg['filters'] = [[self._as_digit(col), e, val] for col, e, val in msg['filters']]
ValueError: too many values to unpack (expected 3)

[MarcSkovMadsen]

It's the same problem with sort.