As far as I know beta versions aren´t uploaded to the EGS, only the last stable version.
TW could add the beta to the EGS but I guess they just don´t give a ****, also your fault because Steam > EGS ¯\_(ツ)_/¯
But you don´t miss much at all so...but that also means you won´t get much at all in the next 8-12 weeks #sad