I have the same issue on my TCL Roku TV.
I have been in contact with the support at discovery+ for the last month, I have done all the usual type stuff and even factory rest the TV for good measure and nothing.
I even sent them a link to a video I made showing the error on every free-to-view channel - I had edited it together with screenshots from the TV guide app I have in my phone.
Thought I was finally getting somewhere with that... Until today where they sent a reply that asked me to clear cache and ensure I have enough storage on the device.... In my mind I think that means they don't have a clue what's wrong it how to fix it.
Just a note but I didn't notice the channels being more than 5 minutes behind until after the clocks went forward.
You've gone to a lot of trouble JellyBabyRiot to document the problem, but discovery+ appear to have done very little. I'm surprised ROKU haven't been able to corroborate the six hour delay, it's very simple to check using a free subscription to discovery+
There's nothing us as consumers are doing wrong. The simple fact is the Roku Discovery+ app has a bug related to the timezone with regards to the live streams.
The EPG is fine, it's the streams that are wrong. You can test this by setting the time on your Roku device manually to six hours ahead - the live streams are then in sync with the website version, mobile apps, Sky et cetera.
It's an entirely reproducible bug that needs addressing by the developers of the Discovery+ app for Roku.
The issue is that the support provided by Discovery+ ends at the point they have exhausted their list of problem solving steps issued to end users - the support department aren't the developers of the app.
