Honda 3000eu issue using a bonding plug

[Jetstreamer]

I made my own neutral ground bonding plug to use with my generator. I had it plugged into one of the outlets on the generator. When I went to use it for the first time, I had a spark and a bit of smoke very briefly come out from somewhere on the panel.
I immediately pulled the bonding plug out and the generator continued to run normally.
I double checked that the plug was assembled correctly and it was. Also there was zero evidence of any arcing or burning on the plug itself. None of the panel breakers tripped.
There was a 30 amp cord attached with a very light load.
I’m out on a road trip and maybe when I get back home I’ll take the panel apart and take a look for any arcing evidence.
Any ideas what may have happened??

[BFL13]

There is a duplex 15a receptacle and a 30a twist type. You used your bonded plug in one of the two 15a? but the 30a was occupied by whatever.

Ok, in a recent thread, it came out that there is something going on between the 15 and the 30 so they are not all the same wiring, so what you got was as though before you do all that needed work with the wiring in behind there, so when you bond a 15, it does not screw up the 30 --or whatever that was all about. ( It was complicated!)

[SoundGuy]

Lynnmor wrote:
Are you sure that the generator was not already bonded?

All Honda EU series inverter generators have a floating neutral.

[Lynnmor]

Are you sure that the generator was not already bonded?

[2oldman]

Have no direct answer, but just wondering why you made this bonding plug..?