fixed in next luatex but in a different way as we then also need to support deeper nesting
\toks2{\def\deepermacro{deeper}}
\toks0{\def\innermacro{inner}\def\deepermacro{weird}\directlua{tex.runtoks(2)}}
\edef\outermacro{outer\directlua{tex.runtoks(0)}}
\meaning\innermacro \par \meaning\deepermacro\par \meaning\outermacro \par
done ------------------------------------------------------------------------ r7186 | luigi.scarso@gmail.com | 2019-09-01 15:25:05 +0200 (Sun, 01 Sep 2019) | 1 line
permit nested runtoks in more complex situations of nesting (HH) ------------------------------------------------------------------------
Awesome, thank you. One further question out of academic interest: What was the problem with my former proposed fix? It seems to give the right result in your example and I currently can't see why it would have problems with nesting. Marcel