Additional.lyx manual not compiling

Currently on an updated TeX Live 2026, for the Additional.lyx manual
(e.g., with default pdf2 format), I get:

! LaTeX Error: Command \columnseprulecolor undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.4221 \renewcommand{\columnseprulecolor}
                                         {\color{cyan}}

I can check whether I can reproduce also on an older system.

Scott

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