Toyo 4x5 film holders and Linhof Master Technika fit question

I'm hoping someone can shed some light on this. I bought some 4x5 Toyo film holders - latest version with the blue lettering and aluminum dark slides - to use with a Master Technika Classic.
The first two holders I've used have had the black material (is it a light seal?) peeled off when I remove them from the camera. I'm wondering what I might be doing wrong here - to be clear, when I remove the film holders, should I pull straight out parallel to the film plane, or parallel to the angled door opening?
Example photo of the holders attached.
Also, what kind of material can I use to patch these up? I tried some black tape I bought from B&H for keeping stray light out of my converted bathroom/darkroom, but that tape is not adhesive enough.

Thanks,

It's not a Toyo film holder issue.
I've experienced the exact same thing with my Linhofs and film holders. The spring back is sometimes silly strong and the tendency is to angle the holder especially during removal.
The best thing I've found is to use my fingers at the closed end to help prise the opening and ease the film holders in and out and avoid angling and dragging the holder.

But I'm open to alternatives.