Thanks for the report. It seems to be a bug. We'll fix it in the next release, in a few days.
A raw code like this should work:
<quote author="aditsu">
Quote
<quote author="aditsu">
Quote inside quote
</quote>
</quote>
But it looks like
aditsu wrote
Quote
aditsu wrote
Quote inside quote
If you insert some text at the end of the quote, it works,
<quote author="aditsu">
Quote
<quote author="aditsu">
Quote inside quote
</quote>
insert text here...
</quote>
Now it works:
aditsu wrote
Quote
aditsu wrote
Quote inside quote
insert text here...