Solved it. It turns out, WKWebKit not only does not need to be wrapped in a ScrollView, it apparently does not work in a ScrollView, and (more or less) does not work only when wrapped in a ScrollView. I put every other tab in a ScrollView before, so did the same with this one. When I simply add it in a VStack instead, it displays fine.
Topic:
UI Frameworks
SubTopic:
SwiftUI