Yes, I read it as a warning. Always pay attention to where the figure in the XII occupies: it indicates a particular trouble. If it doesn't occupy anywhere else, then it's weak and general.
For example, if you're asking a question about, say, the IX house, and you get Fortuna Minor in the V and XII, it may indicate that you're too caught up in your own desires to make progress, and you need to "cool your jets."
As another example, if you get a chart with Fortuna Minor in the XII that doesn't occupy anywhere else, then it suggesting that you should watch out for "jumping the gun" or "burning the candle at both ends," since you'll flame out, but it doesn't indicate a risk of this on any facet of the question in particular.
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For example, if you're asking a question about, say, the IX house, and you get Fortuna Minor in the V and XII, it may indicate that you're too caught up in your own desires to make progress, and you need to "cool your jets."
As another example, if you get a chart with Fortuna Minor in the XII that doesn't occupy anywhere else, then it suggesting that you should watch out for "jumping the gun" or "burning the candle at both ends," since you'll flame out, but it doesn't indicate a risk of this on any facet of the question in particular.