After Samsung rolled out the June software update, some users reportedly that the 8K video recording using the high bitrate mode is no longer available. The 8K button is still there, but the toggle is grayed out. There was no clear information from Samsung until this post was published.
Some sources said this happened due to stability issues. Some users said when they record the 8K videos, the result in stuttering, and videos could be smoother. Samsung is now disabling the feature to fix this issue.
Either way, users will be happy if Samsung mentions something in the changelog or release a statement. Still, the 8K recording as a whole is available, but at lower quality.