Is it possible to see the 3D shapes of the PolygonZ shapefile?
I have Qgis2treejs plugin installed, but it shows the shapes as if they are Polygon so 2D shapes).
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You don't need any plugin to see PolygonZ shapefile in 3D. Built-in 3D Map Viewer ("View > New 3D Map View") shows polygons in 3D based on Z values of its vertices.
Note that 3D view currently doesn't support unprojected (geographic) coordinate systems (I've just learned that), so you need to convert shapefile unprojected CRS to projected one or change CRS of the "QGIS Project" (no need to change shapefile's crs) using "Project > Properties... > CRS". In CRS tab, search or select any suitable projection under projected coordinate system.