Unable to remove custom application code (4239545)

After creating a custom VB application code template, when adding this template to a SQL script, it adds correctly, but when trying to remove the template from the code, nothing happens.
It works ok with a default VB template, but with a custom VB template, this issue occurs.

This issue occurs when using a custom template, and when the line terminator is (") in the template.

This issue is happening due to an invalid template.
The double-quote character is a STRING delimiter, not a line terminator. You would need to use the correct line terminator as is shown in the default template for VB: 

You would need to put the correct string delimiter on on each side of the %SqlText%  macro, like this: