Config section is empty and non-empty

I have this:

defmodule SomeModule do
@my_custom_config_section (Application.get_env(:my_app, :common)[:key1][:key2])

IO.puts("@my_custom_config_section debug1: #{Kernel.inspect(@my_custom_config_section)}")
IO.puts("@my_custom_config_section debug2: #{@my_custom_config_section}")


# ..........


And I have this when trying to run it - during compilation:

@my_custom_config_section (Application.get_env(:my_app, :common)[:key1][:key2])

# goood! the values are correct!

@my_custom_config_section debug1: %{aaa: "", bbb: "fdsafds", ccc: false, dddd: "afdsafdsfdsfds"}


# also good!
== Compilation error in file lib/my_app/some_module.ex ==
** (Protocol.UndefinedError) protocol String.Chars not implemented for %{aaa: "", bbb: "fdsafds", ccc: false, dddd: "afdsafdsfdsfds"}


However! This prints an empty string

defmodule SomeModule do
@my_custom_config_section (Application.get_env(:my_app, :common)[:key1][:key2])

#IO.puts("@my_custom_config_section debug1: #{Kernel.inspect(@my_custom_config_section)}")
#IO.puts("@my_custom_config_section debug2: #{@my_custom_config_section}")


# <--------- emtpy!
# @my_custom_config_section debug3:
IO.puts("@my_custom_config_section debug3: #{Kernel.inspect(@my_custom_config_section)}")


And this founds nothing in @my_custom_config_section:

def my_action(conn, params) do
a1 = @my_custom_config_section

# a1 is empty! Why???


end


At compile time, data exists. At runtime - not anymore.

:key3

IO.inspect(@my_custom_config_section, label: "@my_custom_config_section debug2")

Application.get_env/2

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