NBT data cannot be referenced when creating "Blade of Wanderer".
All types of flammpfeil.slashblade.named can be used as material, and the created Blade of Wanderer will not carry any NBT data.

Forge1.12.2-14.23.5.2838
SlashBlade-mc1.12-r28
SJAP_V1.2.0_MC1.12.2