macOS (BSD) `grep` bug (incompatibility) when using `-mX` with `-Ay` (but not with `-By` nor `-Cy`)

wut.sh

grep --version && uname -v
# grep (BSD grep) 2.5.1-FreeBSD
# Darwin Kernel Version 19.4.0: Wed Mar  4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64

grep -A1 -E "urls = \[" */WORKSPACE
# example_http_archive_locked/WORKSPACE:    urls = [
# example_http_archive_locked/WORKSPACE-        "https://github.com/bazelbuild/bazel-skylib/releases/download/0.8.0/bazel-skylib.0.8.0.tar.gz",

#but:
grep -m1 -A1 -E "urls = \[" */WORKSPACE
# example_http_archive_locked/WORKSPACE:    urls = [

#whereas:
grep -m1 -C1 -E "urls = \[" */WORKSPACE
# example_http_archive_locked/WORKSPACE-    type = "tar.gz",
# example_http_archive_locked/WORKSPACE:    urls = [

#and on Linux:
grep -m1 -A1 -E "urls = \[" */WORKSPACE
# example_http_archive_locked/WORKSPACE:    urls = [
# example_http_archive_locked/WORKSPACE-         "https://github.com/bazelbuild/bazel-skylib/releases/download/0.8.0/bazel-skylib.0.8.0.tar.gz",

#also on Linux:
grep --version
# grep (GNU grep) 2.27