[Python] Cartopy doesn't render left and right longitude labes

I'm using cartopy to draw a geomap. This is how I set up graticule rendering:

if graticule:
gl = ax.gridlines(
draw_labels=True,
linewidth=0.8,
color='gray',
alpha=0.5,
linestyle='--',
x_inline=False,
y_inline=True
)

gl.xlocator = mticker.FixedLocator(np.arange(-180, 181, 10))
gl.ylocator = mticker.FixedLocator(np.arange(0, 91, 10))

gl.top_labels = False
gl.bottom_labels = True
gl.left_labels = True
gl.right_labels = True
gl.xlabel_style = {'size': 10, 'color': 'gray'}
gl.ylabel_style = {'size': 10, 'color': 'gray'}


cartopy doesn't draw longitude labels to the left and to the right of the map. Only bottom and top (if on) labels are drawn:

With ax.set_extent([0, 40, 75, 85], crs=ccrs.PlateCarree()) added:

Latitude labels are okay being inline.

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