LyX 2.4.3: table background colouring and vertical borders

Dear LyX users and developers,

Applying background colour to cells or rows in a table with cell
borders enabled results in some vertical borders adjacent to the
coloured area not being visible in the PDF output.

Environment:
LyX 2.4.3
PDF output via LuaLaTeX (TeX Live 2025)
Standard LyX table inset

The issue seems independent of table content (it occurs even with
minimal or empty tables) and whether cell or row background colouring
is used. Removing all ERT background colouring restores the vertical
borders. A minimal .lyx file demonstrating the behaviour is attached.

Documentation:
The LyX documentation (Embedded Objects Manual, §2.11 “Colored
Tables”) describes table background colouring but does not address its
interaction with table borders.

Is there a known workaround for this in LyX 2.4.x, and do newer LyX
versions handle this case differently?

Best,
Andy

-Andreas Hild

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