Also ran into this bug, while trying an infinity build. Sadly I didn't get the seed for you, greg :( However I did grab as many screenshots as I could.
It all started when I used RED SNULE+, while having an empty deck and a DONT CARE+ in the discard pile.
Then I used RED SNULE+ again and found that I could just use it infinitely.
Then I used one of my other DONT CAREs and got more test cards.
Then I found that none of the cards disappear from my hand, and started spamming PROTEIN SHAKE+. And then I ended the competition.
In the shop I tried viewing my deck.
And on the next competition my hand looked like this:
And the cards didn't work again. I mean I couldn't play my DEEP SLEEP+, it just wouldn't disappear.
And during the competition I also tried viewing my deck, and it gave me different results on every attempt randomly.
But regardless, I finished the run ok, cause I've already got infinite gains, so success?
So there's my little bug report. I wanted to send it to you privately somehow, but didn't find any other way to contact you.
This was a fever dream, and thank you for this experience! Hope this helps.
P.S. I think the PROTEIN SHAKE is bugged again. It didn't double the gains I got from a simple leg workout (or I didn't see anything happen on screen). However it does double the gains you get from OVERTRAINING, and only those, in my experience.