Missing parts of buildings and entire builds in minecraft world

Build 4641655, Branch r/16_H4, SHA; a32349ebc4f4d315b873923dcf3f9d83, Protocol Vcersion 408, DID d8d32a79-b8a0-3cba-8930-0c3fa8c18e08, MCID: F01AF5AF856A29C.

Seed number -644463576. I have been playing this on a new xbox since April of this year. The older version is on an xbox one in another room that has not been used since July. There is 4 months of work on this xbox. I went to play on older xbox earlier this week and current world did not sync to the xbox. I logged into new xbox today and entire buildings are missing that were created post July but there are also items built since July in the world and buildings where entire portions of the building were missing. I am unsure if this is a save corruption issue or a syncing issue. Last logged into new xbox version last night (9/13 - 20:00 CST) and there was no issue with world or save. I did notice that the armor stands were purple yesterday, while I was playing and had a purple skinned skeleton head on them. This is not the case today. They are normal looking armor stands. I am unsure if this is causation due to bug or if this is just correlation. I did attempt to find this bug, for a like report, prior to reporting but could not find something that was similar and had a resolution. Any help or assistance in fixing this would be greatly appreciated. 

Thank you