Unknown Experience IDs in GainExperience event payloads

[leonhard-s]

The GainExperience streaming event regularly returns event IDs that are not yet included in the ps2/experience collection.

I logged about 12 hours' worth of such unresolved experience IDs, resulting in the following (non-exhaustive) list of unknown IDs: https://gist.github.com/leonhard-s/0b76a010d62b351989f5fb1f527ce014