Unity Analytics not working in WebAssembly Builds

I'm having trouble with Unity Analytics in WebAssembly builds. My custom analytics messages are registering with the Validator in the editor, and on the dashboard. Analytics for the same project are working on iOS builds. On WebAssembly builds, only about 5% of custom events are being logged. I've tested in Safari, Chrome, and Firefox. There are no error messages in the console.

Not really sure where to start to fix this. Strange to me that some messages are getting through, so something must be working. Has anybody else had problems with analytics in WebGL/WebAssembly?