Is it possible to know why buildx don't use cache?

[heckad]

In my docker file, I have a run command with mount=bind. For example

RUN --mount=type=bind pip install --no-deps --no-cache-dir . # Install my app

All steps behind this line are taken from cache but starting from this line docker build an image. It looks like some file has changed or what else has happened. How to know why did docker decide not to use the cache?