Random textures appear on screen after videos finish playing in AVPro mode

[natarii]

Users have reported random textures, such as avatar textures or icons from the expression menu, appearing on the video screen after videos finish playing in AVPro mode. Seems like it might be a texture use-after-free type of situation.

The Standby Texture as set on VideoScreenHandler is also not always applied after videos finish, which is likely related.

We haven't seen this issue when using Unity/Video mode.