Please let us catch previous relic step fish with the later versions of the relic.

I have had my Lodestar Fishing Rod since the last step of the gatherer relics came out. As I go through and fill out my fish log in prep for Dawntrail, I realize that there is a fish that I never caught a Deadwood Shadow - a fish that is one of two fish that can be caught for the materials needed in step 5 of the relic chain.

Now that I have finished the relic, I cannot catch that fish until I do an entire new relic. That step is step 5 out of 6. If it were an earlier step, maybe 2 or 3, I wouldn't mind. But step 5 out of 6? I cannot fathom doing it. I don't even understand why we can't catch those fish with the finished relic. It's not like we can sell them and they aren't good for anything except those relic steps, so why keep it impossible to catch? Nobody is going to go out of their way to catch it again unless they missed it for completion, so please, let us catch all the relic-only fish with the finished relic for the expansion.