Using:

$ groff --version

GNU groff version 1.23.0

Spurious warnings:

test.grf:6: Invalid horizontal alignment 'f': must be 'b', 'c', 'l' or 'r'.

test.grf:8: Invalid horizontal alignment 'v': must be 'b', 'c', 'l' or 'r'.

and faulty output are triggered by a:

groff -k -Tpdf -ms -m hdtbl -dpaper=a4 -P-pa4 /tmp/test.grf > /tmp/vde.pdf

on:

.LP

.TBL width='1.2i 0.3i 4.5i'  vl=

.TR

.TD colspan=3 hal=c "English cf Danish"

.TR

.TD    half

.TD  -

.TD  halv     (oldnorse: halfr ; germanic common)

.ETB

The generated pdf table omits both triggering words; they're swallowed as 
formatting control. I'll attach the test file as well, for convenience.

An older version of groff behaved the same, so it's not a recent artifact, I 
figure.

Joachim Walsdorff's account at Heidelberg Uni has expired, so I'll report the 
anomaly here, to begin with.

Erik

Attachment: test.grf
Description: Binary data

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