AFK treasure fishing farm is possible with sculk sensor

The bug

Sculk sensor detecting water splashes allows to create optimized fishing farms like it used to be before 1.15. Although the design is more complex and involves expensive blocks.

How to reproduce

See this video. The explanation given is straightfoward. There is also a world download linked to the video.

Observed results

You can afk fish farm and are able to collect 100% of treasures.

Expected results

You could afk fish farm but not be able to collect any treasure.