CA FTB is requesting a 2016 personal return - can this affect my 2018 return?

My 2018 Federal / State returns have been accepted & are estimated to be in my bank account by 8/30/19 (via direct deposit) at the latest, according to TurboTax.

 

However, I'm worried because the California FTB just sent me a letter saying they need a return from me for 2016 and that I may owe taxes based on their records. The FTB's letter also gave a requested response date of 9/11/19 (after my expected return deposit on 8/30).

 

Will this affect the timely deposit of my 2018 return (i.e. will they withhold my return until I deal with 2016)? Or will the FTB only take collection action if I haven't filed by 9/11?

 

Thanks in advance for any insight & advice.