1.9 tellraw selector color showing as green

I'm adjusting a tellraw command to use with 1.9 and the selector text is showing as green/not bolded, but the rest is displaying correctly. Is there something wrong with my syntax?

/execute @a[tag=!setup] ~ ~ ~ /tellraw @a {"text":"","extra":[{"text":"Welcome ","color":"gold","bold":"true"},{"selector":"@a[tag=!setup]","color":"gray","bold":true},{"text":" to the server!","color":"gold","bold":"true"}]}