ShaderEffectSource with recursive shader causes magenta texture on Apple Silicon

When using a shader effect that depends on a previous texture, the extra texture appears to be cleared to pure magenta on creation, but only on Apple Silicon/Ventura.

This does not occur with Qt 5 (tested with 5.15.3). The documentation states that an extra texture is created and it may make sense to ensure this is cleared on creation.

I have attached minimal examples for Qt 5 and Qt 6.

Expected output (this is seen on Apple Intel/Monterey and Windows 11):

Actual output on Apple Silicon/Ventura: