PF: Can projects on the Postdoctoral Fellowships reserve list possibly start later than the latest possible start date for the call, when informed at a very late stage?

For the Postdoctoral Fellowships 2021 call, including for applicants from the reserve list, 1 September 2023 is the latest possible start date for projects. However, should the researcher/ beneficiary experience issues nearer to the start date that might prevent them from beginning their project on time, then they should contact their Project Officer to see what flexibility might be available, on a case-by-case basis.