So the most blocks that are transparent or have 2d texture overlap.
On transparent blocks (glass block, glass pane, door, etc), the non-visible part is visible and gives a strange appearance. (seen on the pictures)
On 2d blocks (rails, iron bars, grass, etc), it flashes some black stripes (seen on the videos)
"How did it start happening?"
I don't know.
"When did it start happening?"
I think it started happening on the latest update, not sure.
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