Bug (HTML/TexInfo etc):

  Commented code block gets through to exporter when it shouldn't
  [9.4.4 (release_9.4.4 @ /usr/local/share/emacs/28.0.50/lisp/org/)]

See the attached files.  The `.txt' file is actually a `.org' file.

The surprising behaviour--surprising at least to me--is because of the
presence of tabs in the source block, that is commented out.
Screenshots show where the tabs are in org file, and how the HTML
output is rendered.

When I untabify the file, everything looks fine.

I have created this report with `emacs -Q' (i.e., with a capital Q),
and whatever Org that ships with it.

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Emacs  : GNU Emacs 28.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, cairo version 1.16.0)
 of 2021-04-28
Package: Org mode version 9.4.4 (release_9.4.4 @ /usr/local/share/emacs/28.0.50/lisp/org/)