Generally speaking, "is adverb transmitted" would modify "is transmitted", however it could be "is transmitted adverb " to add emphasis. Likewise, " adverb unchanged" is standard, but again "unchanged adverb " adds emphasis. As we can see in your sentence, it's can be unclear, even to native speakers.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
elegantenglishA short answer though: when read in a neutral tone, it modifies "unchanged".I agree. It seems that the adverb "semantically" has stronger collocation with "unchanged" than with "transmitted" here.
elegantenglishAs we can see in your sentence, it's can be unclear, even to native speakers.Provided they understand the word semantically, native speakers will have no problems with this. If an adverb were modifying the verb, it would need to be separated from a the adjective by a comma - It was sent hurriedly, unchanged.