New Marriage, Unfinalized Previous Divorce

Location: Atlanta, GA, USA.

I was previously married and separated from my former husband in October 2021. At that time, we completed the necessary divorce paperwork together. My former husband took possession of the completed documents and advised me that he would file them with the court.
Because the divorce was uncontested and we had no children or marital property to divide, I was advised by an attorney that I would not be required to attend a court hearing. Based on the completed paperwork, my former husband’s representation that he would file it, and the legal guidance I received regarding the process, I believed in good faith that the divorce had been properly filed and finalized.
In April of this year, I married my current husband. We are now preparing to file immigration paperwork, including Form I-130, with the intention of submitting our case in November. As part of that process, I began gathering documentation establishing the termination of my previous marriage.
It was only during this process that I discovered that my former husband apparently never filed the divorce paperwork we completed in 2021. As a result, despite my understanding for several years that I was divorced, I recently learned that my first marriage was never legally terminated before I entered into my current marriage.
Upon discovering this issue, I immediately began the process of formally obtaining a divorce from my former husband myself. I anticipate that the divorce will be finalized within the next one to two weeks.
My primary concern now is determining the legal effect this has on my current marriage. Specifically, I would like guidance regarding whether my current marriage is considered void or invalid because my previous divorce had not yet been finalized at the time of our marriage, and what steps are necessary to correct the situation.
If my current marriage is not legally valid, I would also like to understand whether my current husband and I simply need to marry again after my divorce is finalized, or whether any additional legal proceedings, such as an annulment or divorce relating to the current marriage, are necessary before we can remarry.
Finally, because we are preparing to submit Form I-130 and related adjustment-of-status documentation in November, I would like to understand how this situation could affect our immigration case and what documentation or corrective steps we should complete before filing.
My goal is to ensure that both my marital status and our immigration filings are legally correct before we submit anything to USCIS.