Glass panels not rendering good with default settings:
Graphics: Fancy
Smooth Lightning: Maximum
Clouds: Fancy
Render Distance: 12
Brightness: Bright
Mipmap Levels: OFF/1/2/3/4 same effect.
Searched bug with tags: Glass, panel, rendering, bug, glitch.
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[media][media]

I don't see the correct screenshot on MC-9553 with this type of render bug.