If you use --order Absolute then s will indeed always be null. The normal SxE numbering you're looking for is --order Airdate and since that's default you can just omit --order altogether.
$ filebot -rename *.mkv --db TheTVDB --lang German --output /path/to/output --format "{n}/Staffel {s}/{n}.{s00e00}.{t}" -non-strict --action TEST --log INFO
[TEST] from [atax-miraculous.-.geschichten.von.ladybug.und.cat.noir.s01e26-1080p.mkv] to [Miraculous – Geschichten von Ladybug und Cat Noir/Staffel 1/Miraculous – Geschichten von Ladybug und Cat Noir.S01E26.Volpina.mkv]