Fixed: had the option for ‘allow translucent selection’ checked off
Glass from the glass galleries isn’t selectable in the viewport after placing it and selecting something else. The only way to select it again is to find it in the outliner and select it there.
Repro: Place any glass type from the glass gallery in the level. Deselect the glass. Then try to select the glass again through the viewport.
Expected result would be being able to select glass through the viewport as well as the outliner.