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Critical CSS always fails after running for about 10-15 minutes, getting anywhere from 50 to 80% done, then hitting a REST API error.
I can confirm the REST API works perfectly fine, because I use it in my own plugin on the site.
I have probably about 120 pages in total, and for whatever reason this plugin collects CSS on the front end, which means I have to keep the page open no matter what, which gets annoying after the nth time it fails.