There's a mob it can land on that breaks the cycle (i.e. mobs stop popping) and you need a zone or server reset to get it started from there.
This may not be what's going on, because one of the placeholders at the giant spawn is a mountain giant hillock, and you need to start killing those to see if another cycle mob pops. This can take an hour or more depending on how many are up and how lucky you are.
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