The two screenshots below show what the map should be (screenshot 5FA4F7EE) and how the map is converted to bedrock (screenshot 1640BF1A). It is only these specific chunks that convert this way and it seems to covert them to what the map was a few years ago.
MCPE-59313
Map conversion PS4 edition to bedrock. Some chunks load in older saves
Resolved
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However, this issue is a Duplicate of MCPE-58480.
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