So after today's update and the addition of the snapshot 21w11a, I can't load my server which was left at 21w05b since all the latest snapshots cannot load old worlds.
I tried to load other versions and it seems to load just fine.
Please fix this as soon as possible I can't open my server anymore, or make it so we can play old worlds too in the new snapshots. Thanks!
Edit:
I tried to load 21w05a and it's also broken. But in this one at least it tries to load until it fails and shows the error "Sorry, unable to start Minecraft." at the top right corner, while in 21w05b it does nothing when hitting the Start button.
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But the "old" worlds work up until this snapshot. We can't play in the new ones. If this isn't fixed we cannot open and play in our worlds again until (I guess) the full 1.17 version is released.
Have the same thing since the release of 21w11a. I had a 21w08b server world that I was able to upgrade to 21w11a, but on my 21w05b, if I try to upgrade the server to 21w11a, it says world upgrade arent possible and I can't use the old 21w05b client either, I click the play button and it does nothing.
The launcher loads the version JSON file, but the javaVersion.majorVersion is null on the response which causes the launcher to error.
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I'm slightly confused on what the problem is. Loading of old worlds has been disabled in the new snapshots on the account of generation changes. Also, old versions are not supported on this bug tracker, and you are using an outdated snapshot. As such, we can't guarantee fixes, as this was earlier.