Is a UK DWP spousal bereavement benefit taxable in the US?

My husband was a dual UK-US citizen and was receiving the UK state pension and other private UK pensions.  I have never lived in the UK; I am a USA citizen, residing in the USA.  Upon his death, I received a one-time bereavement payment and twelve months of small monthly payments.  These payments do not appear to be taxable in the UK.  I claimed them on my 2021 tax return but now am having to amend my 2021 return and am wondering whether I can remove this from my amended return?  The tax treaty and related documents are complicated and confusing, but a general principle seems to be that if a payment is not taxable in one state, it should not be in the other.  Can anyone advise on this?