dont access the unloaded "b" attribute on "o" unless it is still attached to its session. when you sess.close(), "o" is no longer attached to a session. also, dont say "del o.b", or insure that you reassign a blank list to "o.b." before accessing it again. the "del" operation deletes the list-based attribute entirely and reverts access on it to its class-based lazy load status, which is why the lazy loader is firing off again.
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