Rendering Artifacts

Hi everyone, sometimes I get such artifacts when rendering, most likely it is caused by smoothing or bloom effect, I do not know for sure. Is there any way to eliminate these artifacts? It is interesting to know your experience of dealing with this

Does it go away if you change your Bloom method to Default instead of Convolution? What size are you rendering your images at?

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I used the standard bloom method. My resolution is 4k. I rendered with bloom disabled and it solved the problem