ffmpeg conversion loses all metadata

[Fishhooks1945]

using linux
when using that one-liner you have linked to convert the wav to mp3, I get an notice from FFMPEG that it is ignoring the metadata because it found more suitable alternatives. However, the resultant mp3 lacks all metadata.

So I use this behemoth of a one-liner to do the conversion and have the metadata copied over. After the conversion, it deletes the wav:
for i in *.wav; do title="$(exiftool -s -s -s -Title "$i")"; artist="$(exiftool -s -s -s -Artist "$i")"; album="$(exiftool -s -s -s -Album "$i")"; date="$(echo "$PWD" | grep -oE '[0-9]{4}')"; track="$(echo "$i" | grep -oE '[0-9]+' | head -n 1)"; genre="$(exiftool -s -s -s -Genre "$i")"; lame --add-id3v2 --tt "$title" --ta "$artist" --tl "$album" --ty "$date" --tn "$track" --tg "$genre" "$i" "${i%.*}.mp3" && rm "$i"; done

To use this command: Make sure you specify Artist and Album per album splitter instructions. For folder, I had to use -o option and not the one in the readme, and have the year of the album first, for example:
python -m album_splitter -yt "https://www.youtube.com/watch?v=vV87qhEJOUQ" --album "Sonic Prayer - Remastered" --artist "Earthless" -o "2022 - Sonic Prayer - Remastered"
The reason why this is important, is because the one-liner that does mp3 conversion, gets the album year off of the folder name

[Fishhooks1945]

I guess i should note that you have to have exiftool and lame installed.

If there is another way to do this with ffmpeg, i'm down to learn, but after 2 hours i just gave up. ffprobe wouldn't read the metadata on the WAV, so I just assumed it was not compatible with ffmpeg no matter what i do, and switched to lame and exiftool