There’s also Hi Meta, WhatsApp with Integrity? | by Tal Be'ery | Medium (no bloat frontend: scribe), Usenix paper and
presentation: WhatsApp with privacy? Privacy issues with IM E2EE in the Multi-device setting | USENIX, lastly: https://eprint.iacr.org/2022/1710.pdf
Another thread where I collected known vulnerabilities: