The [芽] display is a bug. I will fix it in the next update tomorrow.
This is the adjustment I am planning:
| i > 1000000000 = "森"
| i > 500000000 = "林"
| i > 100000000 = "木"
| i > 10000000 = "苗"
| i < 1000 = "芽"
| otherwise = ""