Hi, The WebOS regex is incorrect.
WebOS is LG-TV's OS now.
The correct keyword is Web0S(zero) instead of WebOS(O)

My advice is

- regex: '(?:webOS|Web0S|Palm webOS)(?:/(\d+[\.\d]+))?'

For example. WebOS TV 3.x user-agent is:

Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.2.1 Chrome/38.0.2125.122 Safari/537.36 WebAppManager

You can see as below link:
http://webostv.developer.lge.com/discover/specifications/webos-tv-platform/web-engine/

https://github.com/matomo-org/device-detector/blob/master/regexes/oss.yml#L160

Thanks.