I think the OP is talking about Lemmy having both a content preview and a text area for link posts.
Some users tend to write their own summary in the text area, so when opening up a post, the result will be:
- Large title written by the OP
- Automatic preview of the page, generated by Lemmy
- Text summary of the page, written by the OP
I agree that this is a bit clunky in terms of UX
Good luck with the update! One great thing about 0.19 is that it allows users to check federation status between instances, will be awesome to get that for lemmy.world as well.