Wrong `write-past-end error` when using append fields

[Fusioon]

Code to reproduce:

class Program
{
	class Hash
	{
		int8 _codec;

		uint8[] _hash ~ delete:append _;
		public Span<uint8> Hash => _hash;

		public int Length => _hash.Count;

		[AllowAppend]
		public this(Span<uint8> data) 
		{
			let tmp = append uint8[data.Length];

			_hash = tmp;
			data.CopyTo(this._hash);
		}
	}

	class CID
	{
		Hash _mhash ~ delete:append _;

		[AllowAppend]
		public this()
		{
			uint8[32] data = .();
			Hash hash = append .(data);
			this._mhash = hash;
		}

	}

	static void Main()
	{
		CID cid = new .();
		delete cid;
	}
}

Result: Memory deallocation detected write-past-end error in 101-byte object allocation

Just to note if int8 _codec; is removed the code works as expected.

Tested with: (Nightly 04/28/2024) Build aa4f9f7dfa8f2ad81a6807b87192516d0ce72a1a