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I also encountered this issue. It seemed to be fixed by launching the game like: LD_PRELOAD=/usr/lib/libstdc++.so ./Skeletris

I'd encountered a similar bug where a game came with an older copy of that library.

GL_RENDERER   = Radeon RX Vega (VEGA10, DRM 3.35.0, 5.4.43-1-MANJARO, LLVM 10.0.0)
GL_VERSION    = 4.6 (Compatibility Profile) Mesa 20.0.7
GL_VENDOR     = X.Org