Mobs with the weaving effect, when dying, are unable to replace replaceable blocks with cobwebs

Mobs affected by the weaving effect, upon death, cannot replace replaceable blocks with cobwebs. They can only place cobwebs in positions with air and cannot replace blocks like snow, grass, light blocks, or fire. Notably, killing a mob with the weaving effect in a snowy plains biome may not generate cobwebs at all, as there may be no available space for cobwebs. This can be replicated by creating a flat world with snow.

minecraft:bedrock,2*minecraft:dirt,minecraft:grass_block,minecraft:snow;minecraft:plains