My best fix - I found the old STP 125 via Wayback Machine, download link is:
https://secure-appldnld.apple.com/STP/071-45899-20210526-3fe7359c-0f20-4850-b6ec-da9b197119c2/SafariTechnologyPreview.dmg
ben_at_lumen
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Found the fix!
Choose your Target, select Build Phases.
Expand "Link Binary With Libraries", press the + button
Add your Framework (in this case, VisionKit)... and then choose 'Optional' in the status column.
Not quite sure why this fixes it, but it does.