Can I contribute to an HSA account at a new job if I contributed to an FSA at a previous company (old job) in the same calendar year (2020)?

I found the following on the IRS website (Publication 969) that states the following:

"Other employee health plans. An employee covered by an HDHP and a health FSA or an HRA that pays or reimburses qualified medical expenses generally can’t make contributions to an HSA."

Does the IRS have guidance or any rulings on whether an individual is considered "covered" when employment at Company A (old job) terminates and employment at Company B (new job) begins?