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Not unusual at all
What's more as the filter ages it will probably develop more. Almost all the metal film filters I have ever seen do, except the Questar ones and they cost a LOT more.
What you do:
Obtain some thick opaque paint - tippex correcting fluid will do nicely,
Hold the filter up to the sky so you can see the holes - or holding it against a computer screen might do in a dark room,
Use the applicator to place a dab of tippex over each hole. This should enhance contrast in your image, and makes no discernable difference to resolution.
Eventually when the filter looks like a road sign that has been used for target practice its time to bin it.
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