In version 1.18 I found a bug which, after pouring the axolotl bucket, allows the water to pass through the glass.
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duplicates 1
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Water-logged glass may cause that. You may accidentally place water on glass, so it get water-logged, and spill water all around.
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You waterlogged the glass pane; if a water source would normally form, and there's a waterlog-able block at the location, the block gets waterlogged. This isn't a bug, but intentional design.