Behavior tags work best on languages that are alphabet-based with spaces between words. Hence, this feature is unreliable for logographic languages such as Chinese Mandarin, Japanese, Korean, and Arabic which do not have spaces between words, and also for Thai which is alphabet-based but does not have spaces between words.
Word based tags
For example, if you have a behavior tag involving "火曜日", it will not work if this is a word within a longer sentence.
Sentence based tags
However, behavior tags for these languages will work for whole sentence-based behavior tags.