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It does say "upgrading is permanent" when you improve traps.
Shame sometimes the description is vague, you get dissapointed in the update, and lost your skulls :/
Why dislike the dummy?
Edit: Forgot to answer to the original question that don't stress too much about the updates, you can get 5 skulls even on Nightmare without the "key" upgrades. Just keep trying different traps and playstyles to improve your own play and trap setups.