I thought I read it somewhere, but maybe the mind is going. I'll try to take some measurements shortly, but it may be a few days.

However, what I'm seeing is: 1/8" for 1s chains, 3/32 internal plate dimensions was for 5-8 speed chains, and 11/128 internal plate dimensions is for at least some 9-10 chains, and I believe all 11s chains.

Chain Widths Misinformation

So, in this case, the 11s chain should actually be narrower both internally and externally than an 8s chain, but the change had likely been first implemented with 9s or 10s.