Unable to change autotype keystrokes using predefined fields

[tbradsha]

To Reproduce
Steps to reproduce the behavior:

1. Go to an entry
2. Click on more... → Auto-type settings
3. Add some predefined fields/keys in the Keystrokes field
4. Navigate away from the entry
5. Return to the entry, and the modified Keystrokes field is reset to default

Note that typing something like asdf saves in the entry.

Expected behavior
The Keystrokes field should allow predefined fields/keys, including the following variations:

{USERNAME}
{USERNAME}{TAB}{PASSWORD}
{USERNAME}{TAB}{TAB}{PASSWORD}{ENTER}

Environment

KeeWeb v1.11.8 (0fabdac9, 2019-10-11)
Environment: electron v6.0.2
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) KeeWeb/1.9.2 Chrome/76.0.3809.110 Electron/6.0.2 Safari/537.36

Kdbx File
It occurs on the demo DB as well.

Logs
Nothing was logged.

[antelle]

Temporary hack: type a character and delete it after selecting something from the dropdown.

[tbradsha]

Spectacular! For an example of the workaround, first add it like this, with a character at the end:

{USERNAME}{TAB}{TAB}{PASSWORD}{ENTER}a

Leave the entry, come back, and remove the extra character at the end:

{USERNAME}{TAB}{TAB}{PASSWORD}{ENTER}