The bug

The texture mapping on open non-bamboo fence gates is incorrect, causing some pixels to be stretched twice as wide as they should be.

How to reproduce

1. Download and apply the attached resource pack
2. Place an oak fence gate
3. Open it
4. Observe

Expected results

The checkerboard pattern would have squares of the same size all over.

Actual results

On the opened fence gate, some are horizontally stretched into 2x1 rectangles.

How to fix

The resource pack attached to MC-262953 contains a complete fix for this issue.