fig2plotly does not handle timeseries plots

fig2plotly fails completely if I provide it with a timeseries plot that has datetimes on as the x-axis.
Here's an example with a tscollection mydata, where mydata.Time is double data that is posix time (seconds since epoch), and the mydata.TimeInfo.StartDate is '01-Jan-1970 00:00:00.000'.

fig = figure; plot(myData.accelmeterZ_mps2)

fig2plotly(fig);

Error using response_handler (line 31)
Hm... Plotly had some trouble decoding your 'args'. Are you sure your data or styling object is in the right format? Check out
the examples at plot.ly/api for guidance.

However, if I just plot the underlying data, it works just fine:

fig2 = figure; plot(myData.Time, myData.accelmeterZ_mps2.Data);

fig2plotly(fig2);

Start by reproducing the failure with the tscollection example using fig2plotly(fig), then compare it with the working plot of myData.Time and myData.accelmeterZ_mps2.Data. Inspect the handling of datetime or timeseries plot data around the response_handler error at line 31. Done means the timeseries figure exports successfully without the Plotly decoding error.