budgie-panel crashed with SIGSEGV in g_type_check_instance_cast()

[a]

dont know

ProblemType: Crash
DistroRelease: Ubuntu 20.10
Package: budgie-core 10.5.1+git20200824-2
ProcVersionSignature: Ubuntu 5.8.0-21.22-generic 5.8.13
Uname: Linux 5.8.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu49
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: Budgie:GNOME
Date: Thu Oct 8 23:10:31 2020
ExecutablePath: /usr/bin/budgie-panel
InstallationDate: Installed on 2020-10-08 (0 days ago)
InstallationMedia: Ubuntu-Budgie 20.10 "Groovy Gorilla" - Beta amd64 (20201006)
ProcCmdline: budgie-panel --replace &
SegvAnalysis:
 Segfault happened at: 0x7fac6d152cd0 <g_type_check_instance_cast+64>: movzbl 0x16(%rdi),%eax
 PC (0x7fac6d152cd0) ok
 source "0x16(%rdi)" (0x3948c031fa1e1006) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: budgie-desktop
StacktraceTop:
 g_type_check_instance_cast () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libwnck-3.so.0
 ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_object_unref () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: budgie-panel crashed with SIGSEGV in g_type_check_instance_cast()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
separator:

[Apport retracing service (apport)]

StacktraceTop:
 g_type_check_instance_cast () from /tmp/apport_sandbox_724l0o8d/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.0
 window_weak_notify_cb (data=0x55e03474aca0, where_the_window_was=0x55e034c4a100) at ../libwnck/class-group.c:511
 weak_refs_notify () from /tmp/apport_sandbox_724l0o8d/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.0
 g_data_set_internal () from /tmp/apport_sandbox_724l0o8d/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6600.0
 g_object_unref () from /tmp/apport_sandbox_724l0o8d/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.0

[fossfreedom (fossfreedom)]

Going to close this - this area has been extensively rewritten. If you can reproduce under 22.04 then do please advise.