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Check out the v.221 Spring Blossoms Patch Notes here!
Monster Park's level limit should be REMOVED
At least during the Breakthrough event.
Once you hit level 160 without completing Lv. 140 and 150 missions, you won't be able to enter Intermediate Monster Park anymore.
If that happens, you can't complete any more Breakthrough missions because you must finish the previous mission in order to accept the next one.
I doubt Nexon will do anything about this issue, so make sure you complete all Breakthrough missions before you hit 160.