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Actually, it only happends when Player (or any other NPC ID)
contains in multiple ESM or ESP files (like Morrowind and
Tribunal ESMs, for instance. It turns out that Tribunal is quite
'dirty'... yet an other reason to do not like Bethsoft builders
and programmers :) ).
It becomes 'doubled', and the system finds it invalid - at least
as much as I found out. Looks like it's NPCs-type specific bug
(e.g. there were two instances of containers - unedited from
MW, and edited from my pluging, and I when tried to
getdistance my_container, it worked fine.)

Submitted by Balor, who was too lazy to register :)