Follow-up Comment #2, bug #68809 (group groff): I think the issue is that MULN uses .in \n[pg*mul-ind]u but HU calls H which calls @reset which contains 'in 0 and 'ti so the HU text moves back (and overwrites) text in the first column.
Many other mm commands call @reset so they won't be compatible with MULN.
Patch supplied seems to make your test script work, but I've never looked at
mm so there may be some awful gaffe in there.
(file #59125)
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