Cannot create 3D files with toktx

[pezcode]

Hello 👋

I'm trying to create a 3D texture using:

toktx --t2 --depth 3 out.ktx2 1.png 2.png 3.png

and toktx prints the following error:

toktx failed to create ktxTexture; KTX error: Operation not allowed in the current state.

Is there some setting or incompatibility I should know about? Creating a 2D array texture with the same input images works, so I'm assuming they are not the problem.

Edit: It might be worth mentioning that --depth 1 does not produce this error

[MarkCallow]

Actually creating a 2D array texture didn't work either. The output file would not have been an array texture.