I put everything into a new $10 case :
https://www.amazon.com/gp/product/B07GVH6C21
( "uxcell New 3 Buttons Uncut Insert Key Fob Remote Control Case Shell Replacement for Porsche Cayenne 911 996 Boxster S 986" on Amazon)
Works like a charm.
I suspect the glass cell needs to be next to the other electronics. Only one way to find out :-)