diff --git a/Docs/Whats_New.md b/Docs/Whats_New.md
index 992da4ca..4460dfa4 100644
--- a/Docs/Whats_New.md
+++ b/Docs/Whats_New.md
@@ -24,6 +24,8 @@ Released TBD
   is not supported on platform, but app doesn't actually attempt to render to multiple layers.
 - Fix dynamic pipeline state such as `vkCmdSetDepthBias()` sometimes ignoring pipeline dyamic 
   state flags when called before `vkCmdBindPipeline()`.
+- Remove advertising support for pixel formats `VK_FORMAT_BC1_RGB_UNORM_BLOCK` and `VK_FORMAT_BC1_RGB_SRGB_BLOCK`, 
+  as these can cause rare compatibility problems with transparency encoding.
 - Update to latest SPIRV-Cross version:
 	- MSL: Add support for `OpSpecConstantOp` ops `OpQuantizeToF16` and `OpSRem`.
 	- MSL: Return fragment function value even when last SPIR-V Op is discard (`OpKill`).
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm b/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
index 3192c8ca..6c7106a4 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
@@ -935,8 +935,8 @@ void MVKPixelFormats::initVkFormatCapabilities() {
 
 	addVkFormatDesc( X8_D24_UNORM_PACK32, Invalid, Depth24Unorm_Stencil8, Invalid, Invalid, 1, 1, 4, DepthStencil );
 
-	addVkFormatDesc( BC1_RGB_UNORM_BLOCK, BC1_RGBA, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );
-	addVkFormatDesc( BC1_RGB_SRGB_BLOCK, BC1_RGBA_sRGB, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );
+	addVkFormatDesc( BC1_RGB_UNORM_BLOCK, Invalid, BC1_RGBA, Invalid, Invalid, 4, 4, 8, Compressed );
+	addVkFormatDesc( BC1_RGB_SRGB_BLOCK, Invalid, BC1_RGBA_sRGB, Invalid, Invalid, 4, 4, 8, Compressed );
 	addVkFormatDesc( BC1_RGBA_UNORM_BLOCK, BC1_RGBA, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );
 	addVkFormatDesc( BC1_RGBA_SRGB_BLOCK, BC1_RGBA_sRGB, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );