Fix Pack 3 for Domino 14.0 came out last week and, in addition to the usual spate of fixes you'd expect from an FP, it brought a potentially-significant and -breaking change to the way XPages handles style attributes for components. This is presumably in the interest of supporting the pathological strictures of Content-Security-Policy, but it applies whether or not you have taken any other steps to implement CSP.
The specific change is that the XPages renderers will now take the style attribute, externalize it to a class, and then make a