Alzrius
The EN World kitten
AFAIK, there is not a single level where a full caster does not get either a new spell level or a new spell slot.
To be sure, gaining a new spell level is enough for it not to be considered a dead level. However, I don't think the same can be said for gaining a new spell slot for a spell level(s) that you already have. Otherwise, full casters wouldn't need to have class features at all, something that Pathfinder goes out of its way to add more of for full casters.
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