Delta calculate error in transaction

[tanghaojie]

Describe the bug
Trasaction calculate delta error, when i swap array order.

To Reproduce
a YArray: [1, 3, 2],
swap the order to: [1, 2, 3], use:

yarray.delete(2, 1)     // delete
yarray.insert(1, [2])   // insert

Put two operate in a transaction like this:

ydoc.transact(() => {
    yarray.delete(2, 1)     // delete
    yarray.insert(1, [2])   // insert
})

the delta is error:

If just use two operate, there have 2 correct delta in each event: