wps get updated in Dec 3, 2019 after three years of the last version update and some build recipe changes, which is not included in 19.09: wpsoffice: 10.1.0.5672 -> 11.1.0.8865 (#74769) · NixOS/nixpkgs@9974c07 · GitHub
Also notice the current package contains some unresolved problems as mentioned in the new pr:
wpsoffice: 11.1.0.9080 -> 11.1.0.9126 by Ninlives · Pull Request #82408 · NixOS/nixpkgs · GitHub
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