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Can you please attach some images of your lamp?
Can you please elaborate more like where is the ground pin connected to? (images would be helpful)
If possible, please attach the schematic of your board.
The following white paper on ESD might help you.
Use TVS diodes on the pins or traces those are exposed or potential to catch ESD.
Your link is helpful.
Since this is a new project contains some new patent items, please forgive me can't provide the schematic.
After consulting my colleague, they suggest the same as you.
To add TVS and VAR on some other I/O pins to avoid the unexpected actions.
Thanks for your helping, I'll try it on the next pilotrun.