Minify = True, Doesnt allow rxPaperBook.write?

[charberSPP]

Howdy all! Im seeing a reoccuring issue, where after updating gradle (7.0), and creating a release build with minify & Obfuscation set to true, the write(key,object) function consistently throws an error: paperdbexception: couldn't read/deserialize file

Im seeing suggestions to add a -keep the proguard rules, but no keep seems to work. I was hoping someone might have some insight or suggestions?