I found the solution (at least on my computer). This is not opera related. I just replaced my Vega64 card to an RX 5600 XT and I had this strange issue, but I noticed some other with red icons like Radeon Software, or in browser like mega.nz icon, etc. So I uninstalled the latest driver and the problem gone. So I tried the last 3 drivers, 1 whql and 2 optional drivers, and both optional drivers gave the same result with blurry red icons, but the whql so far seems working fine so maybe try this (if you also have Radeon vga). I hope it helps.
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