cannot generate correctly the difference of a table

I would like to report an error I have been encountering while comparing two tables with latexdiff.

When trying to generate the difference of these two files example.zip

using the commands

latexmk old.tex -auxdir=./aux -pdf -interaction=nonstopmode -f # it works
latexmk new.tex -auxdir=./aux -pdf -interaction=nonstopmode -f # it works
latexdiff --ignore-warnings --math-markup=2 --type=UNDERLINE old.tex new.tex > ./diff.tex
latexmk diff.tex -auxdir=./aux -pdf -interaction=nonstopmode -f # it crashes

the last command crashes with the error:

! Misplaced \noalign.
\toprule ->\noalign 
                    {\ifnum 0=`}\fi \@aboverulesep =\abovetopsep \global \@b...
l.151           \DIFaddendFL \toprule

!  ==> Fatal error occurred, no output PDF file produced!

Interestingly enough, if I comment out in both files the command \usepackage[dvips]{graphicx} at line 34 I have two effects:

the preamble generated is much shorter
I now get the error in a line further down in the document

! Misplaced \omit.
\multispan ->\omit 
                   \@multispan 
l.116 ... \DIFaddbeginFL \multicolumn{3}{l|}{trad}
                                                   \DIFaddendFL \\
....

Since I run in force mode -f, it still able to produce a pdf, albeit it is probably not right looking.

Any idea on how can I fix/mitigate these errors? Thanks!

os: Ubuntu 22.04 pdfTeX: Version 3.141592653-2.6-1.40.22 (TeX Live 2022/dev/Debian)
latexdiff: 1.3.3 (but latest master behaves in the same way) latexmk: 4.76

ftilmann / latexdiff

cannot generate correctly the difference of a table #298