We have the exact same issue with our Safari Web Extension (NSExtensionPointIdentifier = com.apple.Safari.web-extension), but not with our Safari App Extension (NSExtensionPointIdentifier = com.apple.Safari.extension). They are both signed and notarized properly and part of the same install package, yet Safari won't load the Web Extension unless we Allow Unsigned Extensions. As an experiment I've simply changed the Web Extension's Info.plist NSExtensionPointIdentifier value to com.apple.Safari.extension after which Safari loads the extension fine.
As others have reported, I find the following errors in the log:
... Computing the code signing dictionary failed for extension with identifier ...
... Blocking extension with identifier: ...
Has anyone discovered a workaround for this?
Thanks
dtheobald
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