merging user create fixtures problem

i start a blank show an created a PML with shutter fixture, patch this and make a backup.

i open a existing show with an user created Fixture - LED curtain.
patch my fixtures
merge the show with the PML and looking for user created ....
... nothing there
looking for same rev. and it looks that the LED curtain is in the PML show file

my question : does somebody ever merge a user created fixture where an user created fixture exist ?

tx for helping Maikel
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