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Class option belongs to another key

classoption passes options straight to the document class, and the list is open — KOMA targets accept their own DIV=12, BCOR=10mm, headings=small. A few values are rejected anyway. A size arriving this way takes effect while skipping the checks its own key runs, so a mistake in it goes unreported; landscape is honored or ignored depending on how the page was composed. The build stops rather than let either through.

What it looks like

classoption: [a5paper, 12pt]

ERROR: classoption 'a5paper' sets the page size
  Use papersize: a5 instead.
  See https://keystone.knight-owl.dev/errors/misrouted-classoption/

Only the first offender is reported. A base size alone reads:

ERROR: classoption '12pt' sets the base font size
  Use fontsize: 12pt instead.
  See https://keystone.knight-owl.dev/errors/misrouted-classoption/

KOMA's paper=a5 spelling is rejected the same way as a5paper. Landscape reports separately:

ERROR: classoption 'landscape' applies only with geometry: auto
  This document lays out its own page.
  Put landscape among its geometry options: geometry:
  inner=30mm,outer=20mm,landscape
  See https://keystone.knight-owl.dev/errors/misrouted-classoption/

What it means

It sets a size that has its own key

A page size belongs to papersize, a base font size to fontsize.

Move the value to the key that owns it

Everything else in the list stays where it is.

papersize: a5
fontsize: 12pt
classoption: [twocolumn]

It sets landscape, which has a key only some of the time

Under geometry: auto the engine composes the page and classoption: landscape turns it, which is the supported spelling. Give geometry options of your own and the page is yours, so landscape belongs among them. LaTeX honors it in one of those places and ignores it in the other, so Keystone asks for the one that always works.

Move landscape into your geometry options

It belongs beside them. Reverting to geometry: auto also works, and hands the page back to Keystone.

geometry: inner=30mm, outer=20mm, landscape