Paradox actually added new provinces and formable nations and then tied them to focus tree mechanics. It was a nasty surprise not even mentioned in the 1.10 changelog.

I've managed to fuse my mod with the new stuff added by the developers. The mod should be usable again. I'm sorry if the previous version caused you trouble.

Something was probably added, but I totally can't recall what was it and when it happened.

v4.3
Nationalist Spanish formables rework:

- Nationalist Spain will adopt this flag at the beginning of the game when on historical focus:
https://en.wikipedia.org/wiki/File:Bandera_del_bando_nacional_1936-1938.svg

- Nationalist Spain will adopt this flag at when 1938 or "Fuse the Parties" focus is taken:
https://en.wikipedia.org/wiki/File:Flag_of_Spain_(1938%E2%80%931945).svg

- Nationalist-Francoist (non-Carlist) Spain will adopt this flag if monarchy is ever restored:
https://en.wikipedia.org/wiki/File:Flag_of_Spain_(1785%E2%80%931873,_1875%E2%80%931931).svg

- The legend says that if you play until July 1945 Franco will adopt this flag as the flag of Spain (no way to test if it works though - no one plays until 1945):
https://en.wikipedia.org/wiki/File:Flag_of_Spain_(1945%E2%80%931977).svg



This update should go very well together with the newest Spanish CoAs update in my Formable Nations Add-on:
https://steamcommunity.com/sharedfiles/filedetails/?id=1875800995

Russian translation for v4.2

v4.2
bugfix:
Westphalia will now get a core on Westphalia when formed.

v4.1
- massively debugged the code of the mod
- some of the formable nation decisions won't need "Waking the Tiger" DLC anymore
- Prussian puppet can now be formed if you control Berlin OR Konigsberg (which allows you to release DDR as a puppet and then Prussia in the area east of the Oder river)
- added unique cosmetic tag "spain_franco_monarchy" which will load the special country flag different from Carlist and generic one if you manage to restore monarchy via Francoist route
- added many missing adjectives for the formable country names

v4.0 "Germania"

- All nations are now able to create Prussia, Wurttemberg, Westphalia, Schleswig-Holstein, Saxony, Bavaria and Mecklenburg by giving these nations cores via "Form Nation" decision when they occupy core German the provinces of these nations
- Prussia, Wurttemberg, Westphalia, Schleswig-Holstein, Saxony, Bavaria and Mecklenburg can now reform back into Germany when they conquer all of the core provinces Germany
- Soviet Union can now core Sakhalin and Kuril Islands via decison if it owns both provinces (it will strip Japan from cores in the region)
- Yugoslavia will now core all of it's provinces when formed by Serbia, Croatia, Macedonia, Slovenia, Bosnia or Montenegro (even if it lost the cores for some reason)


Both Germany and Yugoslavia are unformable (you can balkanize them again after formation), but Sakhalin and Kuril Islands decision is permanent. Germany can be formed by German minors even if United Germany (formed by FRG or DDR) was already formed once. Both decisions to form Germany (for DDR/FRG and for Prussia/Bavaria/Saxony etc.) are separate. For example Prussia can't strip cores of West Germany and vice versa, so you can balkanize Germany however you like.

v3.1

Update for Spain.
I forced theSspanish independents to get their unique flag by replacing the bugged cosmetic tag "SPC_POUM" with "spain_ic".

I don't know how Paradox could've botched their scripting. I don't even know were the bug is in the code. Anyway Spanish communists will now get their awesome flag based on POUM, as well as their unique red map color.

War flags are now removed completely from this mod. You can enable them again via my War Flags mod.

Russian translation added
thanks for the help @magistrat70