Indeed, the first time it tries to load the world it freaks out, if you close the client and try reconnecting it may load it... if not repeat till it does actually load things after that you should be fine.
My inventory is working fine but I have the furnace bug too, it worked fine the first time I put it down and used it, but the second time I used it the furnace "turned" aka the side with the openings on it moved and now it will not smelt past 50% of the first item
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