I may be missing something simple here but I have this issue in the new map viewer as well as in experience builder. I am getting repeat labels that make these new products basically unusable. Has anyone else had this issue? It works fine in map viewer classic and webapp builder.
This is a current known limitation in 4.x based JSAPI apps like Map Viewer and Experience Builder. I don't have an exact date for the release that will address this but thanks for your feedback and I've brought this post up with the team.