Description:

As shown in the screenshot, when I tried to place a sign in the water, in one direction of the oak fence in the center of this 3*3 water square, the water block where the sign was placed was displayed abnormally, while other signs were placed The water block does not.

Recurrent:

Since I think the problem may be due to the world itself, I put the world's seed in the screenshot.

Then, to the coordinates shown in the screenshot:

[66, 69, 284]

Build the structure like in the screenshot;

Finally, place the sign like in the screenshot (the sign should be attached to the oak fence).