There are currently no open bugs.

"libz-mingw-w64" versions published in Ubuntu

Focal (1.2.11+dfsg-2): universe/misc
Eoan (1.2.11+dfsg-2): universe/misc
Disco (1.2.11+dfsg-2): universe/misc
Bionic (1.2.11+dfsg-1): universe/misc
Xenial (1.2.8+dfsg-2): universe/misc