Configure costum columns - change target panel

[monarch-lfv]

Bug in settings of Configure costum columns.
When a custom set of columns (any but not the last one in the list) is selected on one (target) panel. Let's try to create a new custom column set in another panel. We create and immediately delete. In the source panel, the set changes to the last one in the list (as it should be). But at the same time, the target panel also changes to the last set of columns. Is this a bug?
Video of this operation (better to download): https://cloud.mail.ru/public/5Psz/5eBsYgoAk

[ghisler(Author)]

The reason isn't the creation, it's the deletion:
Whenever you change anything in Configuration - Custom columns directly, and then apply the change, TC will set the custom columns on BOTH sides to the focused custom column in the dialog. This is necessary because the user may have deleted the column he was using, or changed the order of the stored column settings. Unfortunately it's not possible to keep the previous columns, the user may have changed too much to keep track of that.

Therefore I will have to move this thread to "will not be changed", sorry.