Custom BBcode and extra line breaks

[Darat]

I have created a highlighter custom bbcode which is just a simple replacement html <span style> but no matter what I do if I add a button for it on the editor this is what happens for me and my users:

This is what happens when
[HILITE]applying the Highlighter[/HILITE]
custom bbcode via the button in the editor

It inserts a line break before the code and one after.

It also does this on two other simple bbcodes I've added.
Custom BBcode and extra line breaks

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