Commenting out the \page_grd_command_flush_page macro seems to have
reversed the effect. Any pages having columnar text that does not
extend to the last line are now suppressed. How would I go about
adding a conditional that checks to see whether the column is filled
before deciding if a page break is necessary?

\unprotect
\def\page_grd_stop{%
  \endgraf % needed, else wrong vsize in one par case
  \vfill % otherwise weird \placenotes[endnotes]
  \page_grd_command_set_vsize % needed
  \penalty\c_page_otr_eject_penalty
  %\page_grd_command_flush_page
  \page_otr_fill_and_eject_page
  \page_grd_command_set_vsize % why here
  \egroup
  \page_otr_command_set_vsize
  \page_otr_command_set_hsize}
\protect

Thank you!
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