Hi
You do not need to be a slave to the TSS number. Your legs have let you down not a disaster. You can do a recovery low intensity ride. Or Rest day. Over and under’s can be tough. Were they done with a New FTP number? The design of this 90 minute session is empty the Anaerobic tank first so as to tax your aerobic system, that is why it gets tougher and tougher. Maybe dial the % down a couple of percent the next time. Are you drinking an energy drink during the workout. How was your sleep the day of your training session? Just some things to consider.
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