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I notice it is possible to have the size of the brush controlled by pressure, and the opacity controlled by velocity with a brush in the Pixel Persona in Affinity Designer. However, I cannot seem to do this with the Vector Brush tool. Am I missing something? In the Vector Brush options, it will allow me to change from pressure to velocity but it changes for both opacity and size.

Not a bug per-se, but there's a configuration error in Affinity Designer and Photo's raster brush settings while using "Velocity" to control brush size. I noticed this with previous versions and thought it might be addressed in 1.7, but unfortunately it's not. Using velocity to control the brush size is meant to change the brush size depending on the speed at which you draw. Think gel-pen - the quicker you draw, the thinner the line is, and the slower you draw, the thicker the line is. As it stands, in Affinity, it's more of a slow gradual build up in size regardless of the speed at which you draw - sometimes it doesn't really do anything at all to the size. Procreate's 'Gel Pen' brush is a great example of this, and so is ArtStudio Pro's brushes with velocity enabled. Clip Studio Paint also has it, which I used to demo the feature so that you can better understand what I mean. I've uploaded a quick screen recording of this to YouTube to better show what I mean (below). I've boosted the 'velocity' jitter significantly in CSP just to make it obvious, and I've maxed it out in Designer, but it isn't doing much. The velocity feature is super awesome for getting a digital brush to feel and behave 100% like a real ink pen. Would love to see this realised/fixed in a future update.