I have a document attachment that has a slash in the digest and I believe it might be tripping up the replicator. Are slashes allowed in the digest?
I think I got my answer here: https://github.com/couchbase/sync_gateway/issues/1683
That bug is about slashes in the attachment name, not the digest.
Slashes are going to be pretty common in digests, since each character has a 1/64 chance of being a slash. So I doubt any bug with slashes would have made it through testing.