ConvertToOpengl does not always work

```pycon
>>> from manim import *
>>> config.renderer = RendererType.OPENGL
>>> Cylinder.__bases__ # or Cylinder.__mro__
(,)
```

Start by reproducing the provided Python REPL example with `config.renderer = RendererType.OPENGL`, then inspect how `Cylinder.__bases__` and `Cylinder.__mro__` are determined. The issue does not name a file or test, and completion would require establishing why `ConvertToOpengl` does not produce the expected inheritance behavior.

Written by the indexing model from the issue text.