IME, they usually work out the word from the context of what they are reading. When something like that comes up and a child looks at me, I get them to read the whole sentence and then ask them what they think it might say based on how they sound it out. They usually get it. Or, I just say 'ahh, this is a funny/tricky word, it's xxxx' and I just tell them.
Ds1 has had no problem with this - he's in yr1 now.