You describe Two Transfers. Who issued the 1099-R? Is that the first or the second transfer?

I googled "4G" for you.

"A spousal beneficiary would only receive code 4G if they directly rolled assets over from a qualified employer plan to a traditional IRA. If the spousal beneficiary rolled the assets from an IRA to their own IRA, they would receive code 4 on their Form 1099-R."