Thanks for flagging this. I looked into your W6 plan.
Thursday (Anreise Ostern) is correctly skipped since you marked it as unavailable. But Friday April 3rd has your “Erzgebirge, nur Laufen” event set to LIMITED availability with Run only, and IntervalCoach wasn’t picking up on that yet since the training availability feature in Intervals.icu just launched only 2 days ago (Athlete Training Availability). That’s why Friday has no workout and your planned TSS falls short of 509.
I just pushed an update that respects the LIMITED availability setting, so days where you’ve set yourself as available for specific sports will now get workouts in those sports. The max training time setting is also respected. Your plan should pick this up after the next regeneration.