qtdatavis3d: oscilloscope example rendering issues

The Qt Quick 2 Oscilloscope Example doesn't render properly on the referenced target platform. Essentially the axis labels and data series are not rendered (I see only the segments of axes and the scene can be rotated, as in the attached picture).

Mali-400 comes with OpenGL ES 2.0. QSG_INFO confirms that ARM driver is being used. I get the same error with wayland and eglfs plugin.

qt.scenegraph.general: threaded render loop
qt.scenegraph.general: Using sg animation driver
qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms
qt.scenegraph.general: Using sg animation driver
qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms
qt.scenegraph.general: opengl texture atlas dimensions: 2048x2048
qt.scenegraph.general: R/G/B/A Buffers: 5 6 5 0
qt.scenegraph.general: Depth Buffer: 24
qt.scenegraph.general: Stencil Buffer: 8
qt.scenegraph.general: Samples: 0
qt.scenegraph.general: GL_VENDOR: ARM
qt.scenegraph.general: GL_RENDERER: Mali-400 MP
qt.scenegraph.general: GL_VERSION: OpenGL ES 2.0 "67dc026"
qt.scenegraph.general: GL_EXTENSIONS: GL_ARM_mali_program_binary GL_ARM_mali_shader_binary GL_ARM_rgba8 GL_ARM_shader_framebuffer_fetch GL_ARM_shader_framebuffer_fetch_depth_stencil GL_EXT_blend_minmax GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_discard_framebuffer GL_EXT_multisampled_render_to_texture GL_EXT_robustness GL_EXT_shader_texture_lod GL_EXT_texture_format_BGRA8888 GL_KHR_debug GL_KHR_no_error GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth24 GL_OES_depth_texture GL_OES_depth_texture_cube_map GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_npot GL_OES_vertex_array_object GL_OES_vertex_half_float
qt.scenegraph.general: Max Texture Size: 4096
qt.scenegraph.general: Debug context: false