When trying a command to place a block 3 blocks ahead of where a player is facing the command block instead will create the block 3 blocks in the direction the command block is facing. If the player executes the command in their own chat the command will function correctly and place the block where the player is facing.

/execute as @a [ tag = Hider ] positioned as @s positioned ^ ^1 ^3 positioned ^ ^ ^ run /setblock ~ ~ ~ light_block 9 keep