Using Optimizely preview window no longer works in Brave

The preview window fails to load in Optimizely’s paid service. The console shows the following error but there doesn’t seem to be any easy way to determine what is blocking the request. I have shields turned off for the main Optimizely site as well as for individual domains loaded for it’s various resources. This seemed to work fine before about a month ago so as far as I can tell a recent update has broken this. Is there any way to allow the request or to find out what it’s being blocked?

GET https://cdn.optimizely.com/js/17908878585.js net::ERR_BLOCKED_BY_CLIENT

Brave Version: [
Version 1.25.70 Chromium: 91.0.4472.77 (Official Build) (64-bit)
]

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