I have a local network tarball that I'm adding in a dockerfile.

FROM alpine
ADD https://10.10..../...tar.gz package

when I build the dockerfile with buildkit I get an "invalid not-modified ETag" error anytime I rebuild even when I remove the old image before building. I'm suspicious this is not a buildkit issue but I thought I'd check just in case. Any help would be much appreciated.

Just FYI it rebuilds fine when I don't use buildkit.