While trying to set up a toy example for another thread, I stumbled into
a problem. It's been over a year since I did this, but I recall it was
possible to use multiple :results format values e.g.

:results output file link drawer

Using both link and drawer was acceptable with Emacs 28.2 Org mode
9.5.5 (according to my old notebook's CREATOR keyword) but now is
unacceptable with Emacs 30.0.50 Org mode 9.7.11. That is, using drawer
shadows link, and causes the results file to get overwritten with the
output "None" from the source block.

This makes using the :post argument with file-output produced by
src block side-effects less convenient than if the results drawer could
be used, because the results are quoted -- perhaps to form a contiguous
syntax node?

MWE with a pixi environment attached, for convenience.