Same problem here, web Inspector only shows Console, Sources, Audit, and all these tabs are also not working. I'm developing an ionic+capacitor-based app.
Xcode: Version 12.5 (12E262)
Safari Preview: Release 124 (Safari 14.2, WebKit 16612.1.11.10)
Safari: Version 14.1.1 (16611.3.2.1.1)
macOS: Bis Sur Beta 11.5 (Enrolled in the Apple Developer Seed Program) Same problem while I'm on Big Sur 11.4
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I am having the same white screen issue after running my app in Testflight. Has anyone found a fix for this yet?