Sorry for the sentence in Google Translate!

Villagers suddenly move out of the fence while playing a game. Speed is a little slower than Enderman.The distance move out by the villagers was about 20 blocks when confirmed.

Although outside the village, there is a golem trap. In addition, cows and pigs near the village have a total of less than 100 heads.

The number of villagers who move is variable, sometimes one and sometimes four at a stretch.Once out of the fence, the villagers try to return to the village with the where the bed as usual.

Please let me know if there is something wrong or if it's a bug of Minecraft.

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I will add it because there was a new discovery.

The villages have a height difference, and the villagers who are higher in the village move in the air like being pulled in the direction of the arrow(like a attached pic.).