The paths of the effect points in the layer window no longer show the keyframes. You can see the paths but not the little squares of the keyframes with their tangents.
1-double-click on a solid to open its layer window
2-Add an effect with a position point (e.g Write-on)
3-create animation keyframes for the position
result: no keyframes path
(It's not related to the beta, it's the same thing on 18.2.0.)
the same in 18.2.1 (and 18.4)