_repr_mimebundle_ added to the keys if executed from IPython

Hi,

I have a weird behavior when I execute the below code in IPython console (I use IntelliJ interactive console):

from dotmap import DotMap
d = DotMap({'a': 3}) 
d

This returns:

DotMap(a=3, _repr_mimebundle_=DotMap())

And if I test the number of keys:

print(len(d))

I get 2

I cannot reproduce this behavior in regular console, only with IPython

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