My lowpoly model processing time took too long if I use blender file

I made a lowpoly scene with no texture, I just put color in material in blender. Then I upload 31.4mb file and it took too long to process. But when I upload in FBX format, it take 2 or 3 second and ready to publish.

pic below is what I am facing issue uploading blender
Process is green and finish but still loading.

pic below is success process and publishable with Fbx format
Screenshot 2021-10-16 142157

ps. I am using Blender 3.0.0 alpha