Occasional issue in opening RNTuples

[alessandrothea]

Hi @AlbertoPdRF , thank you for this extension, it's great and I use it all the time.

When I started playing with RNTuples I noticed that, in some cases, they cannot be expanded/explored/drawn.
This doesn't seem to be a ROOTJS issue per se, since the ones that the ROOT extension fails to open, are correctly shown by root.cern.ch/js/7.10.0/

Any idea of what is going on?
Here is an example of a rootfile where the rntuples are correctly shown and another where they aren't.
https://cernbox.cern.ch/s/kDMeqd0373zQPcC

In case it's relevant I'm using v1.6.0 (ROOTJS 7.10.0) from Mac

Thank you,
Alessandro