When I open books from all the mods that depend on this mod (such as Wizardry's Spellforger's Codex and Refraction's Information Tablet), the Unicode font always changes to non-Unicode font. I have to click on "Options" > "Language" > "Force Unicode Font" to turn it back, but it changes again whenenver opening a book.

Try disabling the texture packs you are using, if the bug persists then try playing with the isolated mod and reproduce the bug. This bug never occurred to me and I have played with several mods. This problem may not be a problem with Wizardry itself but rather a problem with texture packs or mods that modify the game's font. I'm not sure but I believe that Wizardry uses the game's own fonts and does not make any changes to its rendering engine. PS: Information Tablet is not part of Wizardry, report accurate information that you are sure is related to the mod.

I'm quite certain that I haven't used any resource or resourcepack, and I'm using Minecraft version 1.12.2 with Forge_14.23.5.2860. The only mods I have installed are Wizardry-0.11.2, Forgelin-1.8.4, and LibrarianLib-1.12.2-4.22. However, this issue still persists.

Sure, can you send me your latest.log from .minecraft folder?

Yes. Here it is: https://mclo.gs/jymlOAi