Spell ordering potential bug
This may be working as intended, but I think that there's a bug with Temporary Lockdown and Excavation Technique (perhaps other destroy effects) and tokens. When on the stack, if Temporary Lockdown is destroyed with Excavation Technique, the tokens do not disappear. I would think that since Temporary Lockdown would have to be on the battleground for Excavation Technique to destroy it, the tokens it exiled on entry would be exiled and NOT returned to the battlefield once Temporary Lockdown enters the graveyard. Had the tokens stay on battlefield when this happened in a game.

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Rezzahan#77802 commented
Needs more information. Not all tokens get exiled with Temporary Lockdown. The types of tokens that are not exiled are tokens that are lands, and tokens that are copies of something with mana value 3 or greater. Also, destroying Temporary Lockdown before it exiles stuff makes it not exile anything.