Follow-up Comment #3, bug #66295 (group groff): Also, the GNU _tbl_ man page has disclaimed output compatibility with AT&T _troff_ for years. This is from the _groff_ 1.22.4 man page (2018).
DESCRIPTION
This manual page describes the GNU version of tbl, which is part of
the groff document formatting system. tbl compiles descriptions of
tables embedded within troff input files into commands that are
understood by troff. Normally, it should be invoked using the -t
option of groff. It is highly compatible with Unix tbl. The
output generated by GNU tbl cannot be processed with Unix troff; it
must be processed with GNU troff. If no files are given on the
command line or a filename of - is given, the standard input is
read.
Here's what we say today. It's a bit more carefully worded.
Description
The GNU implementation of tbl is part of the groff(1) document
formatting system. tbl is a troff(1) preprocessor that translates
descriptions of tables embedded in roff(7) input into the language
understood by troff. It copies the contents of each file to the
standard output stream, except that lines between .TS and .TE are
interpreted as table descriptions. While GNU tbl’s input syntax is
highly compatible with AT&T tbl, the output GNU tbl produces cannot
be processed by AT&T troff; GNU troff (or a troff implementing any
GNU extensions employed) must be used. Normally, tbl is not
executed directly by the user, but invoked by specifying the -t
option to groff(1). If no file operands are present, or if file is
“-”, tbl reads the standard input stream.
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