This happens frequently in courts in my home country. There's even polite lawyer codewords so that you don't have to trudge in to court and say
'I'm sorry your honor, I have to withdraw from this matter because my client, who is a bit dim, has just told me at the lunch break that he totally did the thing, and also that he's going to lie his ass off about it when he gets up in the witness box in just a minute'
But the next time you hear a lawyer withdraw because they're 'forensically embarrassed', you'll know what happened
'I'm sorry your honor, I have to withdraw from this matter because my client, who is a bit dim, has just told me at the lunch break that he totally did the thing, and also that he's going to lie his ass off about it when he gets up in the witness box in just a minute'
But the next time you hear a lawyer withdraw because they're 'forensically embarrassed', you'll know what happened