Sorry.
I check my conf file again, I found wayland has disabled by
"/etc/gdm3/custom.conf".
After I edit "WaylandEnable" parameter in "/etc/gdm3/custom.conf", the icon
showed up on gdm3.
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Public bug reported:
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System
-> About Ubuntu
Description: Ubuntu 22.04.2 LTS
Release: 22.04
2) The version of the package you are using, via 'apt-cache policy pkgname' or
by checking in Software Center
gdm3/jammy-updates