This may be somewhat of an X/Y problem. I think there may be something, which you are unaware of, that is causing your issues or there is an unfamiliarity with how pattern tiling works.
Note I'm not using the "bleeding edge" version of AI here, so it is feasible that there may be issues with that version. I wouldn't know. If any of the below fails ...
Create your pattern inside the pattern workspace instead, then you can see it tile as you work. Start with a square or rectangle, create the pattern from that shape, delete the shape, then draw your organic shapes.
You must go into Pattern Editing mode to edit patterns. Pattern creation typically causes, and demands, the breaking of any links when the tile is initially created.
Patterns can not contain linked content. Even things such as internal document links, i.e. symbols, will be broken for pattern tiles.