The bug persisted regardless of driver version. I suspected software issues, so I re-installed Windows again and tried the latest driver from Dell (27.20.100.9635) and from Intel website (30.0.100.9864), though the latter installed with errors and detected the GPU as Intel UHD graphics. Mostly often they are seen in the PIN code screen, Firefox and Intel Graphics Command Center. It's strange that they appear only in certain Windows apps and web pages. About 1st or 2nd of October there appeared glitches such as color strips, black squares, screen twitching and flickering. I got and activated it on, then 10 days later did some upgrade (installed SSD, increased RAM, re-installed Windows and all OEM drivers), and it worked fine.
I faced a strange graphics bug on my Dell Vostro 3500 with Windows 10, i5-1135G7 processor and built-in Intel Iris Xe Graphics.
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