"union that needs padding bytes inside an array" behavior test trips LLVM assertion: "Initializer for struct element doesn't match"

[andrewrk]

Zig Version: 0.10.0-dev.2803+c248af3bd

const B = union(enum) {
    D: u8,
    E: u16,
};

const A = union(enum) {
    B: B,
    C: u8,
};

test "union that needs padding bytes inside an array" {
    var as = [_]A{
        A{ .B = B{ .D = 1 } },
        A{ .B = B{ .D = 1 } },
    };

    const a = as[0].B;
    try std.testing.expect(a.D == 1);
}

$ cmake ..  -DCMAKE_PREFIX_PATH=$HOME/local/llvm13-debug  -DZIG_SKIP_INSTALL_LIB_FILES=ON
$ make -j10 && gdb ./zig -ex 'run test ../test/behavior./zig -I../test -fno-stage1'
zig: /home/andy/Downloads/llvm-project-13/llvm/lib/IR/Constants.cpp:1253: llvm::ConstantAggregate::ConstantAggregate(llvm::Type*, llvm::Value::ValueTy, llvm::ArrayRef<llvm::Constant*>): Assertion `V[I]->getType() == ST->getTypeAtIndex(I) && "Initializer for struct element doesn't match!"' failed.
#10 0x0000000008447ef5 in LLVMConstNamedStruct (StructTy=0x10f0cb10, ConstantVals=0x7ffffffed350, Count=3) at /home/andy/Downloads/llvm-project-13/llvm/lib/IR/Core.cpp:1472
1472	  return wrap(ConstantStruct::get(Ty, makeArrayRef(Elements, Count)));
(gdb) p Ty->dump()
%behavior.bugs.1381.A = type { %behavior.bugs.1381.B, i1, [1 x i8] }
(gdb) p Elements[0]->dump()
{ <{ i8, [1 x i8] }>, i1, [1 x i8] } { <{ i8, [1 x i8] }> <{ i8 1, [1 x i8] undef }>, i1 false, [1 x i8] undef }
(gdb) p Count
$7 = 3
#11 0x00000000010445aa in codegen.llvm.DeclGen.lowerValue (dg=0x7fffffff0480, tv=...) at /home/andy/Downloads/zig/src/codegen/llvm.zig:3454
3454	                    return llvm_union_ty.constNamedStruct(&fields, fields_len);

%behavior.bugs.1381.B = type { i16, i1, [1 x i8] }