Glass panes render as 3D blocks inside inventory GUI menus on Bedrock

Bug description: As a Bedrock player who regularly joins Java servers via cross-play/Geyser, I often run into shop/admin GUI menus (made with plugins) that use stained glass panes as decorative filler for empty inventory slots. On Java these panes render correctly as a flat texture in each slot. On Bedrock, the same panes render as the full 3D pane model, which looks out of place inside an inventory menu. This happens on virtually any Java server using shop GUIs or similar plugins with glass panes as filler — a recurring, very noticeable issue for Bedrock players. As a server admin myself, my only workaround is avoiding glass panes entirely and using full blocks (e.g. black concrete) instead, which shouldn't be necessary. Steps to reproduce: 1. Join a Java server from a Bedrock client (cross-play). 2. Open a custom inventory menu using glass panes as filler. 3. Notice panes render in 3D instead of flat. Expected: Panes should render flat in inventory slots on Bedrock, like Java. Actual: Panes render with the full 3D model, looking inconsistent.