App doesn't exit properly even though the window shutsdown

[vilbeyli]

Case 0

void AssetLoader::FMaterialTextureAssignments::WaitForTextureLoads() found hung:

Output

[2020_08_30-01:54:53]   [INFO]	: VQRenderer::CreateTextureFromFile(): [2.10s] Data/Models/sponza/textures\chain_texture.png
[2020_08_30-01:54:53]   [INFO]	: RenderThread: Handle Window Close event <141ec4>
[2020_08_30-01:54:54]   [INFO]	: VQRenderer::CreateTextureFromFile(): [2.33s] Data/Models/sponza/textures\chain_texture_bump.png
[2020_08_30-01:54:54]   [INFO]	: Window: Closing<141ec4>
[2020_08_30-01:54:54]   [INFO]	: UpdateThread_Main() : Exit
The thread 0x963c has exited with code 0 (0x0).
'VQE-d.exe' (Win32): Loaded 'C:\Windows\System32\ole32.dll'. 
[2020_08_30-01:54:54]   [INFO]	: WM_QUIT!
The thread 0x49cc has exited with code 0 (0x0).
[2020_08_30-01:54:54]   [INFO]	: VQRenderer::CreateTextureFromFile(): [3.42s] Data/Models/sponza/textures\sponza_curtain_diff.png
[2020_08_30-01:54:54]   [INFO]	: VQRenderer::CreateTextureFromFile(): [2.34s] Data/Models/sponza/textures\chain_texture_mask.png
The thread 0xc1ec has exited with code 0 (0x0).
The thread 0xa388 has exited with code 0 (0x0).
[2020_08_30-01:54:54]   [INFO]	: VQRenderer::CreateTextureFromFile(): [3.37s] Data/Models/sponza/textures\sponza_curtain_green_diff.png
[2020_08_30-01:54:54]   [INFO]	: VQRenderer::CreateTextureFromFile(): [2.28s] Data/Models/sponza/textures\vase_hanging.png
The thread 0x9684 has exited with code 0 (0x0).
The thread 0xbafc has exited with code 0 (0x0).
[2020_08_30-01:54:55]   [INFO]	: VQRenderer::CreateTextureFromFile(): [2.74s] Data/Models/sponza/textures\vase_dif.png
The thread 0x85ac has exited with code 0 (0x0).
[2020_08_30-01:54:55]   [INFO]	: VQRenderer::CreateTextureFromFile(): [2.39s] Data/Models/sponza/textures\vase_bump.png
The thread 0xc7ec has exited with code 0 (0x0).
[2020_08_30-01:54:55]   [INFO]	: VQRenderer::CreateTextureFromFile(): [2.00s] Data/Models/sponza/textures\lion.png
The thread 0xa7f0 has exited with code 0 (0x0).
[2020_08_30-01:54:55]   [INFO]	: VQRenderer::CreateTextureFromFile(): [1.99s] Data/Models/sponza/textures\lion_bump.png
The thread 0xc72c has exited with code 0 (0x0).