Well, to stretch a point, in the new snapshots, certain areas in my world can not have blocks be placed on them. Its in an Iron farm (The Iron Titan), and I cant place blocks on a certain area. Also, upon reloading an earlier world, it turns out I could place blocks on some of the spots I couldn't, but NOT on others. So, its expanding ? There is problem placing blocks. That's all I really know.
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Your report seems to miss a part at the bottom
When we (at the bug tracker) ask for a crash report, that means the enthire report
kumasasa
I think you're seeing MC-65040: In that 2x2 space is an invisible Mob (Spider ?)
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Please attach the affected world. Can you provide a video of what happens when you try to place blocks?
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Put it in a compressed folder, if it's too big, upload it to mediafire or another file uploading site and provide the link, if you don't want everyone to see the world, create a new ticket, set security to private and mention this report in it
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What FVBico said, basically.
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It was just the bug MC-65040
Use
/gamemode 0
Does that fix your issue?
If not force a crash by pressing f3+c for 10 seconds and attach it here