When this villager improves his rank with trades, particles start to appear and then I can't do anything because the world acts like I has lag. When I quit the game, the "Saving World" text appears, it stays like that and I must close it with Task Manager. Also when I open again the world, it leaves me in the same start of the video, I tried to do things like break the minecart before trading or trading diferent items but the bug continues. This world is a single-player world.
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Likely so, as in that video, the glass panes are shown to be connected together, which is a feature of OptiFine. See MC-228721.
Yup, this is a duplicate of MC-228721 which was later resolved as invalid due to this issue being caused by optifine. Disable this modification in order to resolve this problem.
Sorry... I didn't noticed that it was a optifine bug. Sorry

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Are you using optifine?