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YouTube has found a new way to load ads | AdGuard Blog
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Crowdsourced "tagging" of the affected area of the video timeline (like Sponsorblock) would fix this, unless Google get really devious and randomize the placement of the ad for various users.
Did you read the article? The article shows a post from Sponsorblock and it specifically states that they turned off sponsor block submissions on effected browsers since they can't be reliable with the new ad delivery method
This breaks the current SB implementation, but if the ad duration is known and consistent across the userbase then it will fix itself as users tag videos with the "new" timestamps.
That only works if the ads served are all the same or at least same time length. Which is very unlikely.