Pretty confident in my solve. The only ones I didn't get myself were 20-down, 29-down (obvious in retrospect), and 21-across (inferred the word, but didn't know the tool).
spoiler
N I X O S
O P K C P
G T K O E M A C S R
N D E B I A N L C L I
O N E T S I R N
M H U M I N T
E D I T O R S P H
O E L E M E N T A R Y
N U C L E I A I P
L G S N G E N D E R
L S U L G L
E X F C E A
L S P E L N
S Z O R I N O S C D
P T
You can imagine my face reading the response of 15 lol I thought it was going to be a specific program hahaha I had a lot of fun with it and there were just a few I missed so I would love to see more like these in the future :)
The official app (maintained by the Lemmy developers) is Jerboa, which is what I've been using. It works well enough, although it always pays to shop around, install a bunch of different clients and see which you like best. Sync, to my knowledge, is the only client, for mobile or web, that renders spoilers in that broken way.