At some point in time a LvlMountainSnowPredator completely (000EEF84) stopped cleaning up and respawning after ten games days like would be expected in the cell named POINorthernCoast11. No matter how long I stay away from area, the frost troll just stays where it was killed with an empty inventory. I'm unsure if there's something that has messed up this particular reference or linked references in the particular area. I realize this is an odd issue and may not be something that can be reproduced. Strangely though I seem to recall the same thing happening in a previous game.
I've pasted the Papyrus output below in case it might be important, but as far as I can tell it's just the script property information and not related to any quest holding in an alias.
prid 000EEF84
sv
--- Papyrus ---------------------------------
lvlpredatorscript:
Script state = ""
::LinkCustom09_var = LinkCustom09 (000B9505)
::LinkCustom10_var = LinkCustom10 (000B9506)
::SoloFaction1_var = (000435A2)
::SoloFaction2_var = (000FBBF3)
::SoloFaction3_var = None
::SoloKeyword_var = LinkSoloPredator (0009E685)