Spejs

Happened to me as well, doubt even a pixel of log was touching water, yet it disappeared.

Place it on the ground and kill.

In a game about survival, where night without light source means certain death, why would you be picky about fuel for your camp fire? Handle of your half-used pick, bird trap, trusty log suit, hats - anything, that has flammable materials in it, should go into fire if the need comes.