Using Ubuntu 16.04 packages for collaboraoffice after the recent upgrade to V6.4 loolwsd isn't working anymore.

I get the following error message starting loolwsd service:
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root@ce ~ # systemctl status loolwsd.service
● loolwsd.service - LibreOffice Online WebSocket Daemon
   Loaded: loaded (/lib/systemd/system/loolwsd.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2020-09-25 14:34:39 CEST; 6min ago
 Main PID: 31338 (loolwsd)
    Tasks: 3
   Memory: 23.7M
      CPU: 655ms
   CGroup: /system.slice/loolwsd.service
           └─31338 /usr/bin/loolwsd --version --o:sys_template_path=/opt/lool/systemplate --o:child_root_path=/opt/lool/child-roots --o:file_server_root_path=/usr/sh

Sep 25 14:34:39 ce systemd[1]: Started LibreOffice Online WebSocket Daemon.
Sep 25 14:34:40 ce loolwsd[31338]: loolforkit version details: 6.4.0 - bfce6f6
Sep 25 14:34:40 ce loolwsd[31338]: Failed to load /opt/collaboraoffice6.4/program/libmergedlo.so: /opt/collaboraoffice6.4/program/libcairo.so.2: undefined symbol: FT
Sep 25 14:34:40 ce loolwsd[31338]: Failed to preinit lokit.
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Although the service is statet running it won't accecpt any connections.
stopping loolwsd.serivce is taking forever and after the timeout the service is finally killed:
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Sep 25 14:41:29 ce loolwsd[31338]: wsd-31338-31338 2020-09-25 12:41:29.400743 [ loolwsd ] SIG   Shutdown signal received: SIGTERM
Sep 25 14:41:29 ce systemd[1]: Stopping LibreOffice Online WebSocket Daemon...
Sep 25 14:42:59 ce systemd[1]: loolwsd.service: State 'stop-sigterm' timed out. Killing.
Sep 25 14:42:59 ce systemd[1]: loolwsd.service: Main process exited, code=killed, status=9/KILL
Sep 25 14:42:59 ce systemd[1]: Stopped LibreOffice Online WebSocket Daemon.
Sep 25 14:42:59 ce systemd[1]: loolwsd.service: Unit entered failed state.
Sep 25 14:42:59 ce systemd[1]: loolwsd.service: Failed with result 'signal'.
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I tested on my production system (i386) as well as in Virtual machine running on VirualBox.
Both servers are experiencing the same issue.

BR, Stefan.