Jigsaw block generation allows leaves to be replaced by path blocks

The bug

Village path blocks can replace leaf blocks. This has been reported before (MC-152323, MC-152389, MC-169293); however, those reports did not include seeds/coordinates. This ticket does not either, it instead uses jigsaw blocks as a method of reproduction.

Steps to reproduce

1. Place a jigsaw block down near trees
2. Enter the following fields into a jigsaw block
   Target Pool

   minecraft:village/plains/streets

   Name

   minecraft:street

   Target name

   minecraft:street

   Turns into

   minecraft:structure_void

3. Set "Levels" to 7
4. Turn "Keep Jigsaws" OFF
5. Press "Generate"
   → Notice path blocks replace leaves

A video is also attached.