There is no texture for Light Grey Stained Glass Pane in the inventory. This does not affect anything outside of the missing texture. Every other glass pane texture is still in the game.
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There is a texture. It's just nearly the same color as the background, making it very hard to see. If you use a texture pack to change your inventory color, you can see it.

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We're tracking this issue in MC-36498, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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