FAWE's developers are working on making the plugin compatible with 1.14.2.
This was a developer announcement in their official support server discord:
FastAsyncWorldEdit for WorldEdit7 (which is what is required for PlotSquared 4) has not yet been released. We get a lot of questions regarding this on the daily, so it obviously needs some clarification. PlotSquared compatibility does exist in a separate FAWE branch, but that branch is having some issues with what could potentially cause chunk corruption. This release is going to get a separate announcement when the time comes. If you want to get this announcement, grab yourself the role in #info. Repeatedly asking for it here or in the plugin reviews isn't going to help anyone.