CouchDB 3.2.1 Problems with manual replication - couchdb

Question

I have two machine (one local developer with OS Ubuntu 21.0 and one remote server with OS Ubuntu 16.04.07 LTS).
On both i have the exact same couchDB version 3.2.1.
On both i have a database with same name (no partitioned).
When using fauxton in the local i can create this view:
function (d) {
d.mdc.forEach(x=>emit(x, 1));
}
But on remote says it cannot compile into a valid function.
I had to change it to
function (d) {
if("mdc" in d)
for(x=0;x<d.mdc.length;x++){
emit(d.mdc[x], 1);
}
}
Additionally, i use this command to replicate the _design/myviews from local to remote:
curl -X POST http://127.0.0.1:5984/_replicate -d '
{"source":"http://user:xxxx#127.0.0.1:5984/mydb",
"target":"http://user:xxxx#127.0.0.1:5985/mydb",
"continuous":false,
"doc_ids":["_design/myviews"]}
' -H "Content-Type: application/json"
But for few days, this does not work anymore. I tried to delete the _design/myviews in the remote but still did not work correctly.
Any suggestions to solve both problems? Thank you.