Minimum ebuild to reproduce the problem

foo-1.ebuild (text/plain), 461 bytes, created by Ulrich Müller on 2020-02-18 17:21:39 UTC

# Copyright 2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

DESCRIPTION="Test ebuild"
HOMEPAGE="https://wiki.gentoo.org/wiki/No_homepage"

LICENSE="MIT"
SLOT="0"
KEYWORDS="~amd64"

S="${WORKDIR}"

src_install() {
	echo test >README1 || die
	einfo "DOCS is ${DOCS-unset}${DOCS+set}"
	einstalldocs
	rm README1 || die

	echo test >README2 || die
	local DOCS
	einfo "DOCS is ${DOCS-unset}${DOCS+set}"
	einstalldocs
}