And yet, what about Matt. 16:5–12
5 When they went across the lake, the disciples forgot to take bread.So, Jesus DOES indicate when it is a metaphor and when it isn't.
6 “Be careful,” Jesus said to them. “Be on your guard against the yeast of the Pharisees and Sadducees.”
7 They discussed this among themselves and said, “It is because we didn’t bring any bread.”
8 Aware of their discussion, Jesus asked, “You of little faith, why are you talking among yourselves about having no bread?
9 Do you still not understand? Don’t you remember the five loaves for the five thousand, and how many basketfuls you gathered?
10 Or the seven loaves for the four thousand, and how many basketfuls you gathered?
11 How is it you don’t understand that I was not talking to you about bread? But be on your guard against the yeast of the Pharisees and Sadducees.”
12 Then they understood that he was not telling them to guard against the yeast used in bread, but against the teaching of the Pharisees and Sadducees.
In the case of John 6, he is CRYSTAL clear -- repeating it twice even after some disciples have left.
If you wish to disregard Christ's words, well, that is your choice
>> “So, Jesus DOES indicate when it is a metaphor and when it isn’t” <<
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This is true throughout God’s word. - Metaphor is always announced in some way.