Yes, if there's a bug here and it can be fixed without a major behavior change then it could be backported.

I'm not clear on what the bug is, though, since there is no example given.  If the Hebrew is encoded as encoded words, it can and will be split in the middle of words, but the RFC2047 reassembly process removes those spaces (ie: this may be/may have been a gmail bug).

Without a test case we can't be sure.