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
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.
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 :)