Can't bind Keybind to LAlt and MCreator change locked Code

So this problem should definitely be fixed because it just bothers me.

I want to create a button that defaults to LAlt but doesn't work because it's not in the list. Well I thought I'll try editing the code and locked "GLFW.GLFW_KEY_LEFT_CONTROL" to "GLFW.GLFW_KEY_LEFT_ALT" and the mod element. But what do I have to find out? MCreator changes it back to "GLFW.GLFW_KEY_LEFT_CONTROL" WHICH shouldn't actually work because it's locked. Then I then have "GLFW.GLFW_KEY_LEFT_CONTROL" to "InputConstants.KEY_LALT" which has also been changed by MCreator to "GLFW.GLFW_KEY_LEFT_CONTROL" EVEN THOUGH it was locked. Can someone give me a logical explanation for this damn situation??? By the way, I'm in a pretty bad mood because of this situation.

And I'm pretty unsure if it's a bug or intentional. 

I use version 2021.3.53117