I tried several patterns, such as using only an upper case, combination of upper and lower cases, combination of single-byte and double-byte characters, etc. but it sometimes worked, and it sometimes did not.
Even though I was able to succeed in not being truncated for one certain pattern, when I tried the same as a second trial, it did not work as expected but got truncated, so I could find any rules of the truncation.
Will manually removing CDTEXT.BIN rectify this issue? (I think Wave Lab has an option not to create this file)