I went into creative to get some glass and it worked. I'm guessing it's because I was trying with quartz glass instead of glass I baked. So it was user error not a bug.
I don't have any mods since I'm kinda new to the game. They're quartz glass slabs and the copper plates are ones I made on the anvil with copper bars. I haven't tried with clear quartz crystals yet since I only have one. I'll go find some and give that and creative a try.
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