in 1.14 the GUI renders transparent custom textures properly
[media]but in the recent snapshot that's broken
[media]transparent textures are rendered none-transparent
[media]Linked issues
duplicates 1
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still in 1.15 pre-1
[media]
[media]
that's what it should be like
Please do not report the same bug multiple times.
Please check if that's still an issue for you in 1.15-pre1.