这里有解释原因：The problem has its roots in APFS, Apple's new file system introduced in iOS 10.3.0. To summarize, some special characters have 2 distinct Unicode representations: the Spanish ñ for example has a precomposed variant (Unicode U+241) and a decomposed variant (Unicode U+110:n and U+771:̃).
Before APFS, it was not possible for 2 filenames which look identical but are encoded with different variants to coexist. The file system was normalization insensitive. On the other hand, in iOS 10.3.0, APFS is normalization sensitive, which led to quite a few issues, some of which we covered at the time here: https://imazing.com/blog/ios-10-3-broke-itunes-file-sharing-on-windows
Now, iOS 10.3.3 is supposed to take care of the issue by re-introducing Unicode normalization of file names:
If upgrading from a previous version, runtime normalization is applied
If restoring after an erase, native normalization is applied (APFS runs in normalization insensitive mode)