Sequelize - 'update' doesn't work without a delay

I have the following code:

 myTable()
            .update(data, {
                where: criteria
            })
            .then(delay(100))
            .then((entries) => {
            ...
            ...

The .then(delay(100)) part sets a delay of 100ms.

If i don't use that delay, sometimes entries (the resulted updated rows) aren't correct, meaning - their fields were not updated. But sometimes they are.

If i'm using the delay, the content of entries is always correct.

So my question is - what's going on here? Why do i have to set a delay in order for it to work?

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