When you convert an old map to a recent version, the loaded world is missing some but not all chests. The same issue was mentioned in MC-70813, and after some tests, I can confirm that the disappearing of chests occurs when moving from 1.7.10 to anything above. Up to 1.7.10, the chests remain with all its content, but past it, they disappear. I tested this using Super Hostile maps after I noticed that some wool chests were missing from the game, and same results were found across all maps (except Iceolation, a 1.12 map). It says the issue has been resolved in MC-70813 but I doubt that's the case.
Testing with same map several time made the same chests disappear. No mods were installed in the previous version - it was vanilla.
EDIT: The screenshot below is looking at the same chest, one in 1.7 and one in 1.8. The chests still disappear in any versions above 1.7.10.
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Thanks, I can confirm that the chest that is there in 1.7.10 is deleted when loading the attached 1.7.10 world in 1.14.4. No error messages appear in the game log.
This should go without saying, but don't expect this issue to be fixed if the world has been opened in versions of the game after 1.7.10. If this is fixed, loading the 1.7.10 world in the version that this is fixed in will no longer delete the chest, but if the world has been opened in any versions in between, the chest will still be missing.
If possible, please attach the affected world to this ticket.