Symfony version(s) affected: 5.1

Given e.g.

foo:
    bar:
        baz:
            access_key: 'literal'#'%env(ACCESS_KEY)%'

it crashes with Unexpected characters near "#'%env(ACCESS_KEY)%'" (note the quotes around literal)

but is succesfully parses at http://www.yamllint.com/

adding a space before # solves it in Symfony, but i was too lazy :)