npm test of current latest browserify v16.5.2 fails in:

Subtest: test/crypto_ig.js
# Subtest: crypto --insertGlobals
1..2
Error: Parsing file /tmp/browserify/node_modules/asn1.js/lib/asn1/base/buffer.js: Identifier 'Buffer' has already been declared (6:6)

Same failure with Node.js v12.16.1 and v14.4.1 on Linux, and v14.9.0 on Windows.

It can be reproduced with:

git clone git@github.com:browserify/browserify.git
cd browserify
npm i
echo 'require("crypto")' > main.js
node bin/cmd.js main.js --ig

I can workaround the failure by commenting out this line:
const Buffer = require('safer-buffer').Buffer;
in:
node_modules/asn1.js/lib/asn1/decoders/pem.js
node_modules/asn1.js/lib/asn1/encoders/der.js
node_modules/asn1.js/lib/asn1/base/buffer.js

I didn't find this issue reported, so wondering if it's expected/known or an issue with my environment or Node.js version.
Thanks in advance.