Warning: stale focus object Object_QMLTYPE_22(0x6000033a9e40), doing manual update. Why?

[bogong]

Hello all!
On iOS application I have this warning:

WRN:SYS 1620718135905 0x60000069c0a0 stale focus object Object_QMLTYPE_22(0x6000033a9e40) , doing manual update [virtual void QIOSInputContext::update(Qt::InputMethodQueries)]:[qiosinputcontext.mm]:[0]

It's happening on clicking of any text input only on iOS application. Everything working fine, but there are a lot of warnings.
Why it's happening and how to avoid it? Is it Qt bug? Or what am I missing?