compatibility and transparent throughput

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GROFF VERSION: 1.19
MACHINE: PC, P4
OS: Linux Redhat 8.0
COMPILER: g++ 3.2

INPUT FILES:  man_ex  mktest
                        Both files are attached

COMMAND LINE:  groff file-name > foo.ps

DESCRIPTION OF INCORRECT BEHAVIOUR:

The file man_ex is a copy of the example  towards the
end of the groff_diff man page.
In compatibility mode, it is supposed to produce a *single*
backslash.  It produces two.
An old ("classical") version of troff does produce a single backslash.

File mktest produces different results with a classical version of troff and 
with groff.
The reason is related to transparent throughput.
Classical troff print "LAST LINE" on the same line as "Line 4"
With groff, "LAST LINE" is printed on the line of "Line 3"
and instead of "Line 4" by itself, you get
\!.mk Line 4

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man_ex
Description: Binary data

mktest
Description: Binary data