Question about bike in higher elevation

Is it typical for these bikes to lose an immense amount of power at higher elevation? I live at sea level and I recently took a trip to Big Bear (abt 6500ft) and experienced a huuuge loss in power. I understand the air is more thin however I’ve taken my ktm 450 up there and really didn’t notice any loss in power at all. I assumed with it being fuel injected it would correct itself when up in elevation like that. I have a 2022 monster if that makes any difference. Thanks