Krfb on Wayland doesn't accept remote keyboard input

[qydw]

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
Description: Ubuntu Hirsute Hippo (development branch)
Release: 21.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
krfb:
  Installed: 4:20.12.3-0ubuntu1
  Candidate: 4:20.12.3-0ubuntu1
  Version table:
 *** 4:20.12.3-0ubuntu1 500
        500 https://mirrors.tuna.tsinghua.edu.cn/ubuntu hirsute/universe amd64 Packages
        100 /var/lib/dpkg/status

3) What you expected to happen
STEPS TO REPRODUCE
1. Run Krfb to enable remote desktop server, allow mouse and keyboard control.
2. Connect to the server using any VNC client.
3. Press any key in any text field (e.g. Lock screen password field) and there should be keyboard input on remote desktop.

4) What happened instead
No keyboard input on remote desktop

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: krfb 4:20.12.3-0ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu61
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Sun Apr 4 16:08:10 2021
SourcePackage: krfb
UpgradeStatus: Upgraded to hirsute on 2021-04-02 (1 days ago)