Cannot select the first item of dynamic forms when it is just created

Steps to Reproduce:
–
1. run the code:

val selected = z.select("", List(("a", "a"), ("b", "b")))
println(selected)

output is "", which is expected. "a" is selected in UI, which is not expected?

2. select "a": output is "". BUG: should be "a"
3. select "a": output is still "". This will be forever if I don't select "b"
4. select "b": output is "b"
5. select "a": output is "a"