I realized this when I died and wanted to pick up the dropped xp/items. Some experience orbs won't be picked up and just spin around you.
This video shows the issue:
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Give yourself some xp, then /kill and then run into the xp orbs. Would be very strange, it worked for me 3 times
Strangely, they also cannot be affected by the target specifier. If I try /kill @e[type=experience_orbs] then it tells me there are no experience orbs.
managed to reproduce it after dying a few times, was in survival, kept jumping into the ravine right onto my xp orbs, now they're just floating
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Unable to reproduce.