I had a HS class of 2021 student leave UCLA after one year and every single prof declined to write a letter because they didn’t know him (student had 2 quarters of straight As at the point they submitted transfer apps).
Ultimately a TA wrote an LoR but this student had to clear that with the transfer AO at each of his target schools.
It was a stressful situation for this student, who did have good transfer admission results. Maybe the TA strike will be over before OP’s kid has to submit apps.