BlockingIOError: [Errno 11] write could not complete without blocking thrown in full screen app with style

Seen with:

• python 3.6.7
• prompt_toolkit 2.0.9
• aionursery 0.3.0
• asyncio

I have a non-standard architecture, where:

• asyncio loop is run in a separate App class
• main app runs async clients in a nursery:

        async with Nursery() as ns:
            ns.start_soon(self.pull_sink())
            /.../
            ns.start_soon(gui(self, self.loop, self.test_queue))

gui is an async function where I create prompt toolkit application.
I call use_asyncio_event_loop with the loop passed from the parent app.
To launch prompt toolkit app I use another nursery context (I will need more concurrent tasks here):

    async with Nursery() as ns:
        ns.start_soon(application.run_async())
        /.../

where application is prompt toolkit app.
In the layout I have TextArea widget, which I initialize with a style for bg and fg colors.
When I create prompt toolkit app as full screen it fails:

    Traceback (most recent call last):
      File "/usr/lib/python3.6/asyncio/tasks.py", line 537, in _wrap_awaitable
        return (yield from awaitable.__await__())
      File "/home/wojtek/.local/lib/python3.6/site-packages/prompt_toolkit/eventloop/coroutine.py", line 90, in step_next
        new_f = coroutine.throw(exc)
      File "/home/wojtek/.local/lib/python3.6/site-packages/prompt_toolkit/application/application.py", line 658, in _run_async2
        result = yield f
      File "/home/wojtek/.local/lib/python3.6/site-packages/prompt_toolkit/eventloop/coroutine.py", line 86, in step_next
        new_f = coroutine.send(None)
      File "/home/wojtek/.local/lib/python3.6/site-packages/prompt_toolkit/application/application.py", line 601, in _run_async
        self._redraw()
      File "/home/wojtek/.local/lib/python3.6/site-packages/prompt_toolkit/application/application.py", line 444, in _redraw
        self.renderer.render(self, self.layout)
      File "/home/wojtek/.local/lib/python3.6/site-packages/prompt_toolkit/renderer.py", line 595, in render
        output.flush()
      File "/home/wojtek/.local/lib/python3.6/site-packages/prompt_toolkit/output/vt100.py", line 601, in flush
        out.write(data.encode(self.stdout.encoding or 'utf-8', 'replace'))
    BlockingIOError: [Errno 11] write could not complete without blocking

Interestingly, when I set full_screen setting to False there is no exception thrown, the style is applied to the widget, and the app is running as expected.
Also, if I do not apply the style to the widget the app runs fine in full screen mode.
Since this is a non-standard usage I tried pulling different string by myself to see if maybe I am doing something wrong that is not mentioned in the docs, but without success.
Do you maybe have a hint whether my approach has a bug somewhere or, less likely, prompt toolkit needs a fix?
Thank you.

EDIT: Another twist - this error appears only when I launch my python program from within midnight commander. It does not appear within xterm.

Reproduce the failure with Python 3.6.7, prompt_toolkit 2.0.9, asyncio, full_screen enabled, and the styled TextArea, comparing xterm with midnight commander. Start at prompt_toolkit/application/application.py, renderer.py, and output/vt100.py around the redraw and flush traceback. Done means determining whether the terminal environment or the non-standard event-loop setup causes the BlockingIOError, and documenting or fixing the confirmed cause.