Not sure I see what the cause for alarm is here?
Josh is 2/4 on goal line pass attempts for 2023. Not great, but only 4 attempts the whole season.
https://www.footballdb.com/statistics/nfl/player-splits/passing/goalline/2023?sort=passatt
Mahomes only has 5 attempts, 3 scores.
And when you combine that with 7 rushing TD's on 8 attempts, that's a pretty good success rate when it's up to Josh to score.
https://www.footballdb.com/statistics/nfl/player-splits/rushing/goalline/2023