The problem is really caused by `accountsservice` packages.
Downgrading them to 0.6.50-0ubuntu1 version (as it was in 20190821 iso) fixes 
the issue:

accountsservice_0.6.50-0ubuntu1_amd64.deb
gir1.2-accountsservice-1.0_0.6.50-0ubuntu1_amd64.deb
libaccountsservice0_0.6.50-0ubuntu1_amd64.deb

I determined the list of these packages by comparing the lists of
installed packages from clean install of 20190821 and fully updated
system (or 20190822 daily iso).

---

Steps to confirm:

```
cd ~/Downloads
wget 
https://mirrors.edge.kernel.org/ubuntu/pool/main/a/accountsservice/accountsservice_0.6.50-0ubuntu1_amd64.deb
wget 
https://mirrors.edge.kernel.org/ubuntu/pool/main/a/accountsservice/gir1.2-accountsservice-1.0_0.6.50-0ubuntu1_amd64.deb
wget 
https://mirrors.edge.kernel.org/ubuntu/pool/main/a/accountsservice/libaccountsservice0_0.6.50-0ubuntu1_amd64.deb
sudo apt install ./*accountsservice*.deb
```

and then reboot.

---

So it is a serious regression.

** Tags added: regression-release

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https://bugs.launchpad.net/bugs/1841079

Title:
  Speech Dispatcher user should not be shown on LightdDM login screen

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