I was watching with the Bournemouth Commentary.
When Gibbs-White had the freekick in th second half, it hit the outstretched arm behind the wall of one of their players.
The Radio Solent commentary team spoke about it on the home commentary for a couple of minutes afterwards, that's why it stuck in my mind. Their take was that his arm was outstretched in an unnatural position and they'd got away with one. It may even be the one that hit McBurnie afterwards. I only saw it at the time and not afterwards.
It was just another decision one of the dopey linesman failed to pick up. I don't even see the point of them these days.