You may recall that William and Harry haven’t gotten along in quite a while.
The bad feelings continued.
By Easter 2019, the brothers attended a service and didn’t speak to each other.

Things worsened after Harry stepped down as a senior working royal in January 2020.
It was a small interaction that may be a sign of hope.
However, it can also be summed up as a courteous gesture or a simple act of civility.
Whether the brothers will ever truly make up remains to be seen.