Relates to MC-164001 and MC-163153.

The bug

Cauldrons, water cauldrons, lava cauldrons and powder snow cauldrons render as solid blocks, rather than rendering as "cutout" blocks. This is a problem for two reasons:

• cauldrons did render as "cutout" upon their first implementation
• hoppers, a visually and structurally very similar block, do use cutout rendering

As a result, any transparent pixels which are in a texture that a cauldron block uses will be rendered completely opaque.

How to reproduce

A resource pack is attached to this ticket which replaces the "blockstates" files for cauldrons (including water_cauldron, lava_cauldron and powder_snow_cauldron) and hoppers with the potted fern. Place one of each cauldron type (including empty) and a hopper in close proximity, and apply the resource pack.

Expected results

All of the ferns would appear fern-shaped.

Actual results

The ferns which represent the cauldrons have a solid white rectangle behind them. The hopper correctly does not have this background.

How to fix

All cauldrons should be changed to use the "cutout" render type (with the exception of water cauldrons, which should use the "translucent" render type instead to fix MC-13187).