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Next.js can create up to at least three webpack compilations. The way we create the singleton for the renderer, there's no way for us to know when we should write to cache. We kind of run in to a race condition.
The solution for now is to put the caching logic for next.js in the that plugin.
I did experiment a bit with making the engine async to support a more direct cache approach, and it would be feasible. Some integrations do require sync operations (mainly jest...), so we would need to build a more abstracted caching layer, that can support either async or sync operations.
Unfortunately, that's not something I have the time for atm, so we'll probably have to revisit that again sometime in the future.