Not an expert - I asked a question earlier in this thread (early June) and can give you my experience. I switched jobs and as a result had excess taken out in 2019 which I discovered in late May when I started my taxes. HR at my job was able to confirm the deadline was extended and provided support of that result to Fidelity, who cut me a check for the excess plus the earnings.
Beyond that I had to make a judgement call given the information I received. Specifically, I followed the advice from MinhT1 that was posted on March 2, 2020. That expert referenced Page 10 of IRS Pub 525 under Excess deferrals. (search for it). I reported the excess deferral as income this year (line 7 of form 1040) and will report what I earned on the investment next year (I'll receive a 1099-R for that). Note that I will evidently also receive a 1099-R for the deferral but will ignore it because I have already reported the earnings. Again - lots of suggestions on how to deal with it...I found a method that I thought made the most sense suggested by an expert and went with it....Good luck
