When using a pickaxe with a Fortune enchantment to break placed red alloy wire, the enchantment works like on ores, it multiplies the wire sometimes. Witnessed using a Tinkers' Construct pickaxe, probably works on others too.

Then this doesn't relate to PR, try reporting to FMP. Dropping mechanics is the same as all multiparts, so breaking other micro blocks should yield the same results, and therefore, an FMP issue.

In fact, don't report to FMP, it has been reported previously: Chicken-Bones/ForgeMultipart#205
The problem is with Tinker's Construct tools, will not happen with vanilla pickaxe