Fish can be composted, but won't drop bonemeal anymore if fished up

In 1.13.2 fishing was changed. 20% of fish caught now come with an aditional item: Bonemeal. This made fishing an ideal pass time while waiting for your crops to grow, since you could use the bonemeal to reduce your wait time.

In the next update as of now, compost bins will be added. Compost bins take organic material and turn it into bonemeal. The issue is that these compost bins only accept plant materials, and not rotten flesh, poisoned potato's and fish.

I suggest fish no longer drop bonemeal when caugt (Because it only makes sense from a gameplay perspective, not a logical one and it breaks immersion), but instead you can use fish to fill 1/5th of the compost bin. The same results, but the implementation is a lot better and it would require very little change.