After https://cgit.freedesktop.org/libreoffice/core/commit/?id=c568eb7d3bb4584867f0a1f0a7965f73097f009b many formulas became "Expression is faulty"
Interesting, how can this Writer META block a Calc issue (namely, "Cell-Formula").
(In reply to Mike Kaganski from comment #1)
> Interesting, how can this Writer META block a Calc issue (namely,
My fault. It's DOCX formula.
Changing parent meta bug.
DOCX-Formula is about mathematical equations, but these are related to Word-made table formulas.