The political and media spin on their decisions can be rather wild.
https://www.wicourts.gov/sc/opinion/DisplayDocument.pdf?content=pdf&seqNo=974608
And you can search for decisions here:
https://www.wicourts.gov/opinions/sopinion.htm
It looks like the crux of the issue is the governor interpreted the bill as an appropriations bill and used their partial veto power over appropriations bills to remove the gerrymander. The circuit courts agreed with that interpretation, the WI SC did not:
"The governor partially vetoed S.B. 971 and modified
substantive portions of its policies. The governor and DPI maintain S.B. 971
was an “appropriation bill” and was therefore subject to the governor’s
partial veto authority. The circuit court agreed with the executive branch.
We disagree and hold that S.B. 971 was not an appropriation bill."
"Turning to the bill at issue in this case, the text of S.B. 971 did
not set aside public funds for a public purpose; therefore, S.B. 971 was not
an appropriation bill. Instead, S.B. 971 created accounts into which money
could be transferred to fund the programs established under Act 19 and Act
20, and it changed other aspects of the “literacy coaching program.” The
bill, however, does not set aside any public funds; in fact, it expressly states
that “$0” was appropriated."
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