Question: $router.push({query})/replace not updating the URL.

Example:

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handleSort({ column, prop, order }) {
    let query = this.$route.query

    query['_order_by'] = prop
    query['_order_desc'] = order === 'descending' ? 'asc' : 'desc'

    this.$router.push({
        query
    })
}

Perhaps you are reusing the reference to the same array in multiple route objects. Object.assign doesn’t do a deep copy. Mutating an array doesn’t trigger a route transition and in the subsequent route navigation triggered by router.push / router.replace the check in transitionTo recognizes no change since it compares the array to itself.

The solution is to work with an array like described here: Pure javascript immutable array

But doing a deep copy is a very weird but also reliable way to not have to write your code overly complicated:

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let query = JSON.parse(JSON.stringify(this.$route.query))