create your scene,
Add a single xp cache object, run the sim for a couple of frames and cancel. That add the cache tags to all the objects in scene that need caching.
so to cache the liquid first. Disable xpfoam cache and object and then run the sim. Once you are happy, then enable xpfoam and cache but go into the liquid object and click on lock cache.
Before you used to need multiple xp caches