In the first, i do any test with a summon of bat.
I change the name and his color, and append a "fly" tag.
( see picture 1)

For my first type with a selector, i got a problem.
The syntax on command type for chat command is bugged.
It exists a bug in the interpretation of the selector brackets.
( see picture 2 )

I kill the bat and press T key for show the chat.
I press the arrow up for browse my commands history but i can't.
The interpretation blocks my request, it expects a correct correction of my last command while this is good !.
I found a solution to work around this problem while waiting for a more stable version. When I'm on a buggy command I press the Escape key once to disable the syntax corrector. So I can still access my command history.
( see pitcure 3 )

When i use the data merge command for change a flag in my bat.
The result is strange, i have a clone of the entity where as i will have only a change of his state.
( see picture 4 )

A little question for the filling_map please ^^.
In the idea of making a treasure map.
I wanted to do tests to explore the new possibilities of the little maps.
Only here, the map is not a block or an entity, it is a tool !.
The Data command does not handle the tools so how do i go about getting,changing or creating the internal nbt/data of my map ?.
( see picture 5 )

I can not say it enough, thank you for your titanic work !