Yeah, just recently looking into this. I have no idea what the upper limit is, but Worldbuilder must have an object limit within the range of 4000-8000 objects.
Looking at Relic's maps, most 8 player maps don't exceed 2000, so the limit must be to prevent the engine from failing.
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#Steam AliasWL%Streak
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- 10.326183.640+6