Safari Technology Preview 54 error when "Prevent cross-site tracking" is checked

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If "Prevent cross-site tracking" is checked, I get the following Javascript error

undefined is not an object (evaluating 'r.get(this,"router").startRouting')
startRouting@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:8:11605
didBecomeReady@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:8:17139
invokeWithOnError@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:7:19393
flush@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:7:19833
flush@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:7:20599
end@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:7:20944
run@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:7:22014
p@https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:2:9026
https://sea2.discourse-cdn.com/swift/brotli_asset/ember_jquery-27e777857b8c0730dacfe09cb11711365d21a5db4f9ee0b85d494e4259cf6cda.js:2:9325

and the page stays white. Not sure if a Safari/Ember/Discourse error, but figured relevant parties would see my report here.

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2

I’ve been seeing this since 52 or 53. If you reload without caching (command - option - R) it usually works.