[BUG] Lost support submodules

[trofim24]

Current Behavior:

npm version 7 (I tried both 7.0.0 and the last 7.5.6) does not download submodules.

Expected Behavior:

npm version 6.14.11 has support submodules.

Steps To Reproduce:

I created 3 repos to reproduce the problem. The first contains package.json with dependencies to install. The second contains submodule. The third contains only Readme.md

1. git clone https://github.com/trofim24/npm.git
2. npm install
   If you do this on version 6.14.11 then the node_modules/npm-bug/npm-bug-submodule folder will exist.
   If you do this on version 7.5.6 then the node_modules/npm-bug/npm-bug-submodule folder will not exist.

Environment:

• OS: Windows 10 2004 or Debian GNU/Linux 9.13
• npm: 6.14.11 and npm: 7.5.6

[trofim24]

Any updates?

[zpv]

Also experiencing this issue and breaks my workflow. I reverted back to 6 in the meantime.
Related (old) issue: npm/npm#6700