No clue, but yes, and that's what failed you (and me) trying to use the HOME_CSC that is not re-paritition this portion, and as a result cause the annoying failure.
Honestly- since I got the phone I have not cleaned flashed so maybe the phone slowed down over time, and this new fresh clean flash took it back to where it was. It is also not a scientific statement, more like a 'feeling' but it is noticably faster.. nothing to do with the dark theme, of course .
What's in the new CSC ? No clue.. sure not complicated country code because it is supposed to be same old XAA when you flash it, then the local SIM forces a re-do (to TMB in my case). Wish Sammy would have some log file somewhere public.