drop rate of wheat seeds is way too low

[f465gt]

Expected Behavior

When using a hoe on a gras block it is expected to occasionally drop some wheat seeds.

Actual Behavior

Despite using up an three iron hoes completely I only got one single wheat seed. So the drop rate seems way too low.

Steps to Reproduce

Use a hoe on a gras block.

Debug information

• Debug link: https://hastebin.com/qociweduji
• Timings link (if relevant):

Crashdump, Backtrace or Other Files

Checklist:

• [] I included a /debugpaste link
• [] I made sure there aren't duplicates of this report (Use Search)
• [] I made sure I am using an up-to-date version of Nukkit
• [] I Made sure the bug/error is not caused by a plugin

[f465gt]

I just noticed that I only get seeds when I destroy a grass block. As far as I remember seeds were gained when a block was "ploughed".