St.text_input & st.text_area have an issue for expecting an argument "placeholder"

An argument “placeholder” seems to be updated new via ver.1.2.0.
even though the current version 1.2.0 of streamlit is in my labtop,
st.text_input & st.text_area doesn’t get that argument.
is there anything else I can do?

the function of argument “value” in st.text_input and st.text_area is equal to “placeholder

st.text_input(label, value="placeholder information put here", max_chars=None, key=None, type="default", help=None, autocomplete=None, on_change=None, args=None, kwargs=None, *, placeholder=None)
st.text_area(label, value="placeholder information put here", height=None, max_chars=None, key=None, help=None, on_change=None, args=None, kwargs=None, *, placeholder=None)

I’ve already solved this problem. Thanks.
But, both of them are different.
“value” : kind of default message
“placeholder” : disappearing message when I write like guideline.
plus, they are incompatible