Cannot convert 2d array from numpy to julia

I use `PyPlot`, and `plt.subplots` returns an array of axes:
```
using PyPlot
fig, ax = plt.subplots(2, 2)
```
Before a recent update, `ax` was a Julia `AbstractMatrix`, so it supported all normal array operations. Now it is
```
PyObject array([[,
],
[,
]],
dtype=object)
```
and I cannot do e.g. `ax[end, end]`. Converting explicitly also does not work as expected: `PyArray(ax)` gives `KeyError: key "O" not found` (I guess it doesn't support object arrays yet?), and `convert(Array, pg.ax)` gives a 1d array of `PyObject` arrays, instead of a 2d array of axes.

Am I missing something, or array conversion like this is not implemented yet?