Aliases are not being replaced on full match

My resolve.alias collection contains (among others) these to aliases:

"app/user": __dirname + "/common/user",
"app/user/action-proxy": __dirname + "/other/folder/action.proxy"

Then, when executing webpack those requiring “app/user/action-proxy” are not being replaced properly and instead, are being resolved to:

__dirname + “/common/user/action-proxy.js”

Which then obviously build complains because there is no such file.
It looks like the replacement is done with any part of the alias name.

Is this an expected behaviour?