Setting windows can not be closed

Start stellarium, click on 'location window' set the location, click on the X icon on top right, the location window does not close. Same problem with all configuration windows.

corrado@corrado-n7-hh-1104:~$ inxi -SCGx
System: Host: corrado-n7-hh-1104 Kernel: 5.8.0-25-generic x86_64 bits: 64 compiler: gcc v: 10.2.0
           Desktop: GNOME 3.38.1 Distro: Ubuntu 21.04 (Hirsute Hippo)
CPU: Info: Quad Core model: Intel Core i5-1035G1 bits: 64 type: MT MCP arch: Ice Lake rev: 5
           L2 cache: 6144 KiB
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19046
           Speed: 1043 MHz min/max: 400/3600 MHz Core speeds (MHz): 1: 1866 2: 2290 3: 1763 4: 1400 5: 804
           6: 3173 7: 1336 8: 3388
Graphics: Device-1: Intel Iris Plus Graphics G1 vendor: Dell driver: i915 v: kernel bus ID: 00:02.0
           Device-2: Realtek Integrated_Webcam_HD type: USB driver: uvcvideo bus ID: 1-6:3
           Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1080
           OpenGL: renderer: Mesa Intel UHD Graphics (ICL GT1) v: 4.6 Mesa 20.2.1 direct render: Yes
corrado@corrado-n7-hh-1104:~$

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: stellarium 0.20.3-1
ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
Uname: Linux 5.8.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu51
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov 18 08:02:37 2020
InstallationDate: Installed on 2020-11-04 (13 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20201104)
SourcePackage: stellarium
UpgradeStatus: No upgrade log present (probably fresh install)