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Description
An h1 is used in each of the buttons. This is difficult from an accessibility point of view, as there should generally only be one h1 tag per page. You could argue about this within articles, but it is not a good idea here.
Furthermore, it is not possible to recognise the function of the button using a screen reader, as only the number and the label are read out. It is not possible to recognise that it is a filter.