Is this a bug?

Okay so I'm currently trying to catch Illuminati Perch, they are rather impossible to get with high enough collectibility for me without patience.

So what am I doing?
I use patience, and when it runs out, I afk til I have full GP and try again.

In the middle of the buff I got the "the fish sense something amiss. Perhaps it is time to try another location"

So I walked some steps to the left but the buff disappeared.

I know this is a way to prevent botting, but I feel like it hurts real players.
Was it really intended to work that way?

I was wondering if this could happen myself.

Patience and Patience II need to not go away if you move

I'm positive this is intended... and that makes me sad :/

This is working as intended from my understanding. Its not tied to the use of buffs/GP but forces you to move on after fishing too long at one spot. I believe it is an anti-bot mechanism.