This was actually a bug caused by the fact you cannot run multiple JCEF instances using the same cache folder.
It will be fixed with v0.3.0 🙂
https://github.com/CCBlueX/LiquidBounce/commit/0ea8751899d738cbb16c41d2b9c62146453e9132
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1zun4 committed to CCBlueX/LiquidBounce
fix: unable to run multiple MCEF instances (#2803)