I had something similar happen with Zeus from a force closure. I waited a few days for what I assumed was a lockup period, The tx id wasn't showing up on mempool, they told me to delete my neutrino peers with high ping and restart the app. After I did that the tx eventually broadcast.

Had me panicking for a while but eventually I got where I needed to be. Also not sure how Phoenix handles it versus what my problem was with Zeus that fixed it.