Weird square at the top-right corner

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As shown below, a weird square shows up after I open a project for some time. It disappears if I restart the IDE. Actually this also happens when I use Android Studio. 

OS: macOS

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May you show your about info (IntelliJ IDEA > About IntelliJ IDEA)? 

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IntelliJ IDEA 2021.3 RC (Ultimate Edition)
Build #IU-213.5744.202, built on November 25, 2021
Licensed to JetBrains Team

Runtime version: 11.0.13+7-b1751.19 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 12.0.1
GC: G1 Young Generation, G1 Old Generation
Memory: 2048M
Cores: 16
Non-Bundled Plugins:
org.nik.presentation-assistant (1.0.9)
org.jetbrains.plugins.go (213.5744.202)

Kotlin: 213-1.5.10-release-949-IJ5744.202

 

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