If we use 4 seegrasses to 4 turtles, there might a chance that they breeding 3 times.

Details:

After 2 turtles eating their seegrasses, I fed the third turtle. You can see that the third turtle moving to the second turtle.

Then I fed the fourth turtle, the third turtle would turn to the forth turtle and breeding.

After their breeding, the second turtle and third turtle will breeding. That's to my surprise and I think it's an issue.

Reproduce:

1. Fed 2 turtles normally.
2. Fed another 2 turtles immediately.
3. Waiting for their breeding.

There might a chance that the issue occured. (Not 100% happened)

Information added on 2022/5/24:

When this situation happening, one of those turtles can digging sands too fast.