I found a couple of "perk shards" as loot on corpses, and as with most loot I have the option to either take it (F key) or use it right away (R key). Assuming default key bindings.
The problem is that if you take the perk shard with the R key, you will get two perk points instead of one. When you loot it normally with the F key, you end up with only one perk point; it gets consumed anyways and doesn't end up in your inventory either way.
If anyone else can find perk shards, can you confirm...

Perk shard consumable gives 2 perks