I also have this issue. Uploaded successfully yesterday, I got the 'Processing' message displayed for a while, then when I checked back today, the 'Processing' message disappeared. I got no emails related to this from apple, and when I try to upload again it tells me that I cannot upload with the same version. Does that mean that the build is still under review ? I'm very surprised that App Store Connect isn't at least showing a processing or failed status if there's something wrong with the build.

I'm still facing the same issue. Anyone else still having this problem ?