Blocks affected (list may be incomplete):
Corner stairs
Double chests
Vines
Connected fences
Connected iron bars
Connected redstone dust
Connected cobblestone walls
Connected glass panes
Connected melon/pumpkin stems
Banner (patten) colors
Connected chorus plants
Does not seem to be world specific.
Linked issues
is duplicated by 6
MC-130090
Upgrading a 1.12.2 world causes issues (e.g. double chests not connecting)
Resolved
MC-130297
Redstone dust gets disconnected when updating world
Resolved
MC-130399
Redstone does not stay connected when upgrading to new snapshot
Resolved
MC-130415
Bug in glass pane, iron bars, fences and stairs when you load a world from 1.12.2
Resolved
MC-130513
Glass Panes do not connect when loading a world from 1.12.2 to 18w22b
Resolved
Attachments
Comments 12
Making item frames MC-130422 since they're not technically blocks.
This needs to be reopened. The issue is still very present in 18w22b. Loaded my 1.12.2 world in 18w22b and everything was disconnected as per bug description.
qmagnet, yes. When I test the latest snapshot, I always go to the most recent backup of my 1.12.2 server world, to start "fresh". I've pinpointed the issue to a huge chorus plant that I have, which breaks at the base upon loading in 1.13, causing a more or less significant lag spike.
If I open the world in 1.12.2 and break the chorus tree beforehand, the world then converts "correctly" in 1.13. There will still be some disconnected blocks here and there, but to a much lesser extent.
My best guess is that for one or a few ticks, all connectable blocks are disconnected upon loading. Then after that delay has passed, the connections take place. If a lag spike occurs at that time, the connections never take place.
In my case, I don't mind the issue too much as I have some kind of workaround (destroy that plant before updating the world) but it shows that something can, and will, prevent a proper conversion. A lot of people have things in their world that may cause lag spikes and TPS drops at loading.
Can you please upload the world somewhere, give us a /tp command to get to the chorusplant and let us know what render distance you are using so we can attempt to replicate the problems.
@Grum, sure. Let me prepare this and upload it. It may take a little while, as I only have 1Mb/s upload speed. I'll message you the link and info on Reddit shortly (unless someone tells me how to do it here!).
Hi! I started a new creative sp world in in 1.12.2, placed chests, fences and then updated to 18w22b. exact same problem. unfortunaely i am away from my pc till sunday. let me know if you still need a save till then
Fry
Add banner colors. Many item frames are turned then popped. North facing item frames stayed. There was a thunderstorm right before upgrading. Afterward skeleton horse traps won't activate.