Bill C-3 does not include any requirements, as you have pointed out, for individuals who become citizens by descent to pass security or criminality screenings, or to pass a language or knowledge test.
What we're talking about is Canadians who were born Canadian citizens. They are considered to be citizens by descent. Citizens by descent currently do not have to undergo any of these tests.
Furthermore, most of those who were excluded from citizenship because of the first-generation limit are those born after 2009, when it came into force. This means you're looking at a cohort that is largely minors—16 and under—if this bill comes into force this year. They are generally deemed lower risk for security and criminality purposes.
Citizens born after the bill comes into force are essentially newborns or very young children when their parents apply for their proof of citizenship. These babies or young children do not pose a security risk in becoming citizens.
Similarly, Canadians who are born citizens by descent are not required to demonstrate their official capacity for knowledge of Canada. On principle, this cohort of citizens by descent should not be subject to such requirements as well. This is consistent with the changes we made in 2009 and 2015.