TYPO3 Core

Did you also try `{namespace esi}` to mark the namespace as known but ignored by Fluid?

We tried that and get an error message again, since it'll try to load a non-existing "esi" Viewhelper then. I think last year we even tried to write a dummy viewhelper at some point, but it didn't solve the problem either.

Unfortunately the project went live by now, so we can no longer just swap the source and test. We should have a follow up project later in the year where we can try again on a parallel installation.