[General] Custom MyCodes don't work

[fizzwidget]

I made some tests and my problem is more specific.
I use myCodes to create image viewers (lightbox) for pictures which are uploaded on dedicated hosting (like imageshack). Since 1.8.15, standard myCodes for images are processed before custom MyCodes, so these ones don't work anymore.

Do you think it is a wished behavior or do I need to open an issue ?

Regards