Issue with output format of "mom" macro document

[Richard Ellis]

groff version 1.22.3.

I have a test 'mom' macro file formatted as below:

.DOCTYPE DEFAULT
.PRINTSTYLE TYPESET
.COPYSTYLE FINAL
.PAPER LETTER
.FAMILY T
.FONT R
.PT_SIZE 9.5
.AUTOLEAD 1.125 FACTOR
.COLUMNS 2 0.25i
.START
The quick brown fox jumped over the lazy dog.

Except that in the real file, the last line is repeated 249 times to
create a longer output.

When I render that file using this groff command line:

    groff -mom -Tps test1.mom > test1.ps

I get an output postscript file where the first page is typeset
properly, but the second page has both columns of text typeset on top
of each other, and both columns are in the column 2 position (right
hand column) on the page.

I also get the same result if I render to pdf.

Did I overlook a critical 'mom' macro in my test input file, or did I
discover a bug?