I have successfully loaded all types of logs into the furnace. Coal, and Charcoal do not work when placed manually.
/setblock ~ ~1 ~ minecraft:standing_sign 0 replace {Text1:"{\"text\":\"Test\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/say Test\"}}"}
I have successfully loaded all types of logs into the furnace. Coal, and Charcoal do not work when placed manually.