Help troubleshooting 413 errors (payload doesn't look that large)

Hi all,

I’m having trouble figuring out why this payload is getting rejected by Sentry with a 413 (Payload Too Large) error. It doesn’t seem to be too big (64 KB pretty-printed), I can’t find any large arrays or long strings. Could someone give me a few pointers as to how to determine what’s triggering this error and how I could work around it?

This is the full JSON payload:


And if you trim/remove the payload, it works?