Incorrect timezone / programme time for NowTV in Hong Kong

First of all thanks for a very useful tool. I'm trying to use WebGrab++ with TVHeadend 4.3 in Hong Kong for NowTV.

In nowtv.ini, timezone is set to Hong Kong which is UTC+8:
site {url=nowtv.now.com|timezone=Asia/Hong_Kong|maxdays=7|cultureinfo=en-US|charset=utf-8|titlematchfactor=90}

In guide.xml, programme start for Day 9 and Night 9 are 20190122000000 +0800 and 20190122080000 +0800 respectively:

Australian Open Tennis 2019 Day 9 [Live]
Sports
Tennis

Australian Open Tennis 2019 Night 9 [Live]
Sports
Tennis

However in local time, Day 9 should start at 0800 and Night 9 should start at 1600.

Am I correct in expecting programme start for Day 9 and Night 9 should be 20190122080000 +0800 and 20190122160000 +0800 respectively?

Also changing EIT offset in TVheadend between UTC, UTC+8, UTC-8, local server time, stopping and restarting TVH and triggering internal EPG grabber doesn't affect the EPG.

I have included site.ini, site.channels.xml, WebGrab++.config.xml, WebGrab++.log.txt and guide.xml. Mono version 5.8.0.108. Thanks in advance for all the help!