docker build triggers useless gpg passphrase dialog

I'm on linux (working with docker engine). I started fiddling with docker-credential-pass in order to be able to do this:

aws ecr-public get-login-password --region us-east-1 --profile myprofile \
         | docker login --username AWS --password-stdin public.ecr.aws/z7f783hdj

ok that's now working. but...

Problem

Now everytime I do

docker build --progress=plain `#--no-cache` -t=myimage -f Dockerfile_great .

I first get a useless gpg diaglog window asking for my passphrase:

Passphrase
Please enter the passphrase to unlock the OpenPGP secret key

I just hit Cancel and then (and only then) the actual build starts.

How do I get rid of this useless dialog. Why is it coming??

My details:

# cat ~/.docker/config.json       # shows
{
	"auths": {
		"public.ecr.aws": {}
	},
	"credsStore": "desktop",
	"credHelpers": {
		"public.ecr.aws/z7f783hdj": "pass"
	}
}

Thanks for tipps and suggestions.

Start with the reported ~/.docker/config.json, especially the desktop credsStore and pass credential helper entry, and reproduce the behavior with the shown docker build command after the ECR login. Trace which credential-helper entry is invoked during the build; done means the build proceeds without an unnecessary GPG passphrase dialog.