I experienced the same phenomenon during my entire build phase and posted this. I feel the adaptive training needs calibration a bit. With the suggested training, I always was “tired” status thus never got recommended build phase type training. Okay, you can adjust the “real” tiredness but this is overly sensitive. This being said, I was fine with “tired”, should adaptive training let you recover enough to allow a couple of harder build focused sessions per week? Another xert behaviour is about linear progression; there not a 3-4 weeks block where one week would be recovery. It is up to the rider to figure it out by adjusting the progression; it defies the purpose of adaptive training. I would expect xert to be smart enough to incorporate periodisation within a marco cycle.
In the end, I have been training with"classic" approach over 30 years; xert is certainly a change in philosophy that I still need to get comfortable with.