HSA and Medicare

Medicare and HSA Contribution - I turned 65 in July 2020, my wife turned 65 in Sept. 2020.  I have  an HSA account that I  contributed to the maximum for a family for 2020, with my last contribution in Nov. 2020.   I will lose my job working for a large bank  and their HDHP coverage in December 2020, so I will apply for Medicare A and B now, and ask for a January or February 2021 effective date.  When I receive Medicare effective in 2021, will the IRS look back at my 2020 HSA contributions and penalize me because I did not stop making contributions 6 months earlier?   I have always used Turbo Tax Premier Download and will continue doing that for 2020 and 2021 tax returns.