Safari flash plug-in failure

[windywalks]

I'm on DP 3 now and I'm still (ever since DP1) having an issue where Safari displays a plug-in failure message instead of the content.

I tried clearing cookies, deinstalling and reinstalling Flash to no avail.
The same doesn't happen in Firefox or Safari Technology Preview, so the common plug-in works, just not in the bundled system browser version.
Any ideas I could try to make this atrocious but still useful plug-in work?

I am also having an issue where the ad privacy panels on websites such as MacRumors display more than once a day asking for the same thing, requiring me to disable the analytics and ad cookies all the time.
This is probably cookie related, but I can't get to the bottom of it.

 

[MacGizmo]

Give it time. Early betas suck.

 

[Ritsuka]

It has been just fixed in the latest Safari Technology Preview, I guess it will be fixed in Safari too in the next beta.

 

[windywalks]

It works alright on beta 3.
macOS didn't update last night as I chose auto install at night option and I thought my MacBook Pro was already on DP 3, but it was still on DP 2.