ARRAY OF STRUCT wrongly initialized when only one element is given

[mhasel]

Given the following example

PROGRAM mainProg
    VAR
        incorrect : ARRAY[0..1] OF STRUCT2 := [(x1 := TRUE, x2 := 128, x3 := 12, x4 := 421)]; // wrong initializer
        correct : ARRAY[0..1] OF STRUCT2 := [(x1 := TRUE, x2 := 128), (x1 := TRUE, x2 := 128)]; // correct initializer
    END_VAR
END_PROGRAM

    TYPE STRUCT2 :
        STRUCT
            x1 : BOOL;
            x2 : DINT;
            x3 : DINT;
            x4 : DINT;
        END_STRUCT
    END_TYPE

our generated IR differs significantly between the two variables. Here is what we generate, when multiple (at least 2) array members are specified:

llvm_value: "[2 x %STRUCT2] [%STRUCT2 { i8 1, i32 128, i32 0, i32 0 }, %STRUCT2 { i8 1, i32 128, i32 0, i32 0 }]",

This is what happens if we only specify 1 element:

llvm_value: "[4 x %STRUCT2] [%STRUCT2 { i8 1, i32 0, i32 0, i32 0 }, %STRUCT2 { i8 0, i32 128, i32 0, i32 0 }, %STRUCT2 { i8 0, i32 0, i32 12, i32 0 }, %STRUCT2 { i8 0, i32 0, i32 0, i32 421 }]",

Not only is the single element no longer initialized as we'd expect, the llvm array value now also magically has a length of 4 instead of the declared length of 2.