The path should generate out in the direction the jigsaw was pointing like it does in villages. Instead, it also generates out from the back as well as the front which can ruin some structures if you are creating a path away from something.

Steps to Reproduce:

1. Give yourself the following jigsaw block:

/give @s minecraft:jigsaw[minecraft:block_entity_data={final_state:"minecraft:structure_void",id:"minecraft:jigsaw",joint:"aligned",name:"minecraft:street",pool:"minecraft:village/plains/streets",target:"minecraft:street"}]

2. Place the block facing any direction but up/down

3. Set the level over 1 and press generate.