CouchDB replicate attachment twice

replicate_att.sh

#!/bin/sh

# Create test DBs
echo "***** SETTING UP DBS *****"

curl -s -XDELETE 'http://adm:pass@localhost:15984/source'
curl -s -XDELETE 'http://adm:pass@localhost:15984/target'
curl -s -XPUT 'http://adm:pass@localhost:15984/source'

echo '{
    "_id": "c2561fa83ffe5658a60b6ee757000e49",
    "count": 1,
    "_attachments": {
        "1mb_of_text.txt": {
            "data": "'"$(base64 -i 1mb_of_text.txt)"'",
            "content_type": "plain/text"
        }
    }
}' > payload.json

echo "**** CREATING DOC + ATTACHMENT **** "
curl -s -XPOST 'http://adm:pass@localhost:15984/source' -H'Content-Type:application/json' --data-binary @payload.json
curl -XGET 'http://adm:pass@localhost:15984/source/c2561fa83ffe5658a60b6ee757000e49'

# Replicate to target
echo "*** REPLICATE 1st TIME ****"
curl -XPOST 'http://adm:pass@localhost:15984/_replicate' -H'Content-Type: application/json' --data-raw '{"source": "http://adm:pass@localhost:15984/source", "target": "http://adm:pass@localhost:15984/target", "create_target": true}'

echo " ***** UPDATE DOC *****"
# Update 'count' in doc
curl -XPOST 'http://adm:pass@localhost:15984/source' -H'Content-Type: application/json' --data-raw '{
  "_id": "c2561fa83ffe5658a60b6ee757000e49",
  "_rev": "1-3ddeb6f3d3d3f03f88586e6ebd4c018d",
  "count": 2,
  "_attachments": {
    "1mb_of_text.txt": {
      "content_type": "plain/text",
      "revpos": 1,
      "digest": "md5-1QgRMiOm8E99aKuoi3cKPw==",
      "length": 1024000,
      "stub": true
    }}}'

echo "***** REPLICATE 2nd TIME ****"
# Replicate again to target
curl -XPOST 'http://adm:pass@localhost:15984/_replicate' -H'Content-Type: application/json' --data-raw '{"source": "http://adm:pass@localhost:15984/source", "target": "http://adm:pass@localhost:15984/target", "create_target": true}'

echo "**** SLEEP 10 sec wait for compaction ****"
sleep 10
echo
echo
echo "******* CHECKING SOURCE AND TARGET ******"
echo

curl -s -XGET 'http://adm:pass@localhost:15984/source' | jq '.sizes.file'

On main:

...
*** SLEEP 10 sec wait for compaction ****


******* CHECKING SOURCE AND TARGET ******

1057125
1057134

On 3.4.2

**** SLEEP 10 sec wait for compaction ****


******* CHECKING SOURCE AND TARGET ******

1057125
2085227