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Sorry for the delay: somehow I have not received any responses via email.
The blocked calls have mostly been local Israeli numbers (when incoming they appear as 0… and are recognized properly even if I have them listed as +972… in my phonebook). However, there has also been a declined call from the US number of a friend of mine. It is registered as +1… in my phonebook; I do not remember whether normally it appears in the 00… or +1… format on the screen when I receive his calls.
So no special characters, only 0/00 or +(country code & phone number).
P.S.I am not sure but I think there used to be an option to change the level of call filtering in the settings of call blocker. Now it’s either “on” or “off” anyway, and I neither messed with the settings prior to detecting the bug nor see now an option to limit the scope of call blocker only to the specifically blacklisted numbers.