Glass panes and fences not connecting

Glass panes and fences do not connect properly when joining a world with them already placed down. They are treated as independent blocks, not connecting to other fences or panes around them.

The issue is visible from the moment you join the world, no extra action is required. The blocks spawn disconnected.

Expected result: Glass panes and fences automatically connecting, looking visually connected

Actual result: Connection does not occur, leaving them as single blocks