yes sir, same issue I noticed from day 1 and it is really annoying, For me its on my Mac, not sure if you're running mac or pc but I can easily reproduce this with these steps
click on a playlist
go and do a search or something in the search box
do what you want with the results
go and click back on that SAME playlist from step 1 and it goes into a rename state
Please fix this soon Pioneer, thanks