Backdated Termination and Coverage End

My last date worked was late 12/29/25. On 1/11/26 I put in to use some pto time so I was paid 5 hours of PTO (combo sick and vacation). they have still not terminated my employment, I am still being scheduled, and my insurance is still active and being used.

when they do terminate me, are they able to backdate end of coverage all the way to 12/29? or are they limited to a max of 30 days because of the time requirement around providing a notice of Cobra? (Around a life event occurring, not the 14/44 day requirement around giving sign up info- I'm unsure if my plan is self administered or not yet so not sure if 14 or 44 days would apply)