Out of all RECENT products I bought, and as having a studio and playing guitar live I bought quite a lot of stuff, I only found 2 products having big problems with phantom power: One was YAMAHA piano CP4, the other is YAMAHA - L6 Helix.
Now that this problem with L6 products only comes out after they've been bought by YAMAHA, might or might not be a coincidence.
This issue does not bother me a lot, i bought two blockers for small gigs where only small mixers are available, I keep them in my bag and bring them out when needed. It bothers me a lot instead the answer I had from YAMAHA for the piano: it's a professional keyboard so is supposed to go with a professional mixer, meaning i presume that lots of their own mixers, that cost even more than the so called professional piano, are unprofessional. And it bothers me a lot the silence from YAMAHA - L6. At least i learned something, next time I want to buy a piece of gear when I try it out I will definately try its behaviour with phantom power, then I'll decide if it bothers me or not, and if to buy it or not. Expecially if it's a YAMAHA product