Wrong label of axis of plopp.scatter of multiple DataArrays

[celinedurniak]

Using these inputs (from online documentation)

a = pp.data.scatter()
b = pp.data.scatter(seed=2) * 10.0
b.coords['x'] += sc.scalar(50.0, unit='m')

pp.scatter({'a': a, 'b': b}) gives a plot whose y label is a[K]. But if a and b are plotted separately the label of the y axes is [K].
Adding x='x', y='y' as argument does not change the plots.
See enclosed screenshots