When placing a colored glass block on top of a normal glass block, the face inbetween them starts to glitch out. It starts shaking and stretching slightly.
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Torabi
Torabi: I checked before I posted and nobody had posted. That issue and the one that it "was a duplicate of" were posted while I typed mine up.
Duplicate of MC-34766. This probably happens with most, if not all, transparent blocks.