Books don't reflect update/ change in ID3Tag of audiobooks

No matter what I try, it seems like during first import of an audiobook from my HDD it scans ID3Tag for info about the name, author etc. but if I try later to change ID3Tag of a file (for my own easier cataloguing purposes) this change is not reflected in Books app. I tried to rename the file, delete all folders and files related to Book or iBooks in Library folder to force it for library reindexing, delete file from the library and re importing it back, somehow it is always able to recognize the file and automatically reassign the old ID3Tags as name or author, even tho the file has already different tags. The only thing that gets updated is the Cover art. Any suggestions? Is there a way how to make it re-cache or reindex with new values?