Ok. As I said earlier, it is sort of a layer 2 looping. I see some Verizon/Actiontec devices support Spanning Tree Protocol (more specifically ECB5240M) to support redundant links and loop prevention. FiOS One TV box is not made by Actiontec I believe. If you want MoCA connection, I suggest you to manually disable WiFi for stability. I don't have a FiOS One, so I cannot give you the steps to do so.
I wish Verizon can create emulators for different devices' configuration pages, so we as users can help each other more efficiently.
Looks like there is an incompatibility between MoCA in the FiOS Network adapter an the FiOS ONE minis. You could open a support case with Verizon to try and figure it out. If you want to do that, start here: https://www.dslreports.com/forum/vzdirect. They are much more helpful than the front line support reps.
If you just want to move forward now that everything is working, I get that.