When you load your world at any 1.13 snapshots, the glass panes that you placed down on most of your builds break and they unstick from each other and on solid blocks next to them. This occurs on certain chunks of your world that you load. This also happens on cobblestone walls, fences, and iron bars. The cobblestone walls disappear and turn invisible and you can walk through it but can't place blocks in it.
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@[Mod] violine1101 I think 1.11 or older than the said snapshot version above.
What was the last version the world was opened in before you opened it in 18w16a?