Windows 1.5.6 Fishing Qualities bugged?

ArsenicFlask

Newcomer
At level 10 Fishing I have always consistently gotten Iridium quality fish on a perfect catch and gold quality fish on non-perfect catches. But recently I have barely gotten any Gold fish and not one Iridium fish. I have changed nothing on my save file. Could this be a bug that came along with the latest patch?
 
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