Hello,
1.When you break a Barrier Block the Symbol will stay a little bit longer.
2.In the Update you can not give or set a Block with ID, Iknow that is want but its really bad. All Maps must be updatet!!! Please make it so, that you can make it with both or only ID. 😞
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Third, do not forget to create two different tickets because these are two different things.

Duplicate of MC-47660. As indicated, please only report one issue per ticket. Also, please not that in order to properly implement the Plugin API, it is required that IDs not be used. This is indicated in many places.
First, there's been warning saying that numeric ID's arent supported anymore. Second, the barrier bug is intended.