I created a simple demo extension to demonstrate this bug:
https://github.com/lenacohen/Safari-Test-Extensions/tree/main/dnr-redirect-block-priority
The DNR rules can be found here: https://github.com/lenacohen/Safari-Test-Extensions/blob/main/dnr-redirect-block-priority/DNR%20Test%20Extension/Resources/background.js
The mock extension is designed to be tested here: https://efforg.github.io/privacybadger-test-fixtures/html/ga_surrogate.html
lena44
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