Thanks to the question raised by Xiaozhuan last week. This week I checked this question with our linguist.
/ed/ in wicked, naked are pronounced as /id/. These are exceptions to the rule of /ed/ pronunciation after a voiceless consonant.
Another two exceptions are crooked, learned, all with a sound of /id/. But if crooked is used as a verb instead of adjective, then it is still pronounced as /t/. e.g. I crooked /krukt/ my arm.
The words with exception are all adjectives. Not sure about the reason, and it’s up to your understanding. My understanding is: this may be related to the mouth shape in the first sound of above words.
