This is due to enforcement of Structural Schemas in 4.4 - it requires that you obey all of the various "types" defined within the ClusterServiceVersion.

DV Operator's CSV uses some strings in the values for `spec.customresourcedefinitions.owned.specDescriptors.value`. The value here is typically not set by you, but in your case, you are attempting to set a default value.

The best way to resolve is just by putting brackets around the string. Here are some PR's that show examples of fixing the issue in the CSV...

https://github.com/kiegroup/kie-cloud-operator/pull/349

https://github.com/operator-framework/community-operators/pull/1162/commits/5901b9027d8911f4df46244620d27a7ec70b18c8