Sign missing text when replacing button

When using a command block to replace a button with a sign upon pressing the sign appears without text.

Steps to recreate:

1. Enter the following command into an impulse command block:

   /setblock ~ ~ ~-1 oak_wall_sign{front_text:{messages:['""','"TEXT"','""','""']}}

2. Place a button on the north face of the command block
3. Press the button
   → A seemingly blank sign is placed
4. Exit and rejoin the world
   → Text is now visible on the sign

Expected Behaviour:

When the button is pressed it should be replaced with a sign displaying the text defined within the command block, without having to reload the world.