It seems, (as of Fabric Generator 1.20.1, latest version 2023.3), gui procedural elements are not working at all. This is quite odd considering the gui itself does hold up well, it's just using ...

When I remove tank overlay from a GUI (below), the mod fails to compile with following error: Executing Gradle task: build Build info: MCreator 2025.2.28610, neoforge-1.21.1, 64-bit, 16108 MB, Windows ...