american english - Are differing pronunciations of "second" a regional difference?

According to Wiktionary the word "second" can be pronounced one of two ways in the US:
/ˈsɛk.(ə)nd/
and
/ˈsɛk.(ə)nt/

I've googled to try to find anything about the difference between these pronunciations, be it morphophonemic or simply a regional variation. However my search was to no avail as "second" is a common word, often with results of alternative/second pronunciations of other words popping up.

Can anyone enlighten me on why there is a difference in pronunciation of this word?

For reference, I'm from the US South and I say it with a final "t."