It’s not recommended which is why I asked VERY early on in this thread why the OP used Bonding. It will suck like hell & is quiet soft but if you look at the pics, it’s such a small area it’s hardly worth bothering about.You don't tile onto bonding - finish plaster or one coat plaster, yes, but not bonding or browning.
I’m not getting into an advice auction on it; do what you like, I’m gone.