Unnessecary Duplication of Fields in Edit-Config mode

[kyleb0321]

When attempting to build an RPC to edit access lists using the Native model, I noticed that the RPC builder will add unnecessary tags whenever the build RPC button is hit. For example, I will test a value, change the value in the builder, hit clear RPC, and then hit Build RPC again. When I check the output of the RPC builder, the XML tags will be duplicated unnecessarily.

First click:

After clicking "Clear RPC" and "Build RPC" a few times:

As far as I am aware, this does not seem like intended behavior, as it requires a full reload of the yang model to reset the tags to the unstacked version. I am running the latest version of yangsuite in docker.