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It's a misunderstanding that evolution leads to only positive behaviours remaining. Eating your own tentacles might be similar to humans cutting themselves, or the stress response behaviours spillover by zoo animals: a spillover réaction that turns adaptive behavioural patterns (eating) into maladaptive (eating yourself)

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Very few humans cut themselves and it has very limited health consequences for those who do.

Evolution predicts that self-harming behaviour will be observed less frequently compared to self benefitting behaviours.

So whenever an apparently self-harming behaviour is observed it is quite useful to ask: "is it really self-harm or secretly useful somehow?". And also: "how often does that really happen?"

You also need to ask yourself "is there a way to do a useful thing without this". Like, evolution can't jump, if the same gene expression gives you better pattern matching and improved chances of hallucinations, depending on the selection drift, you might go for this, and then you are stuck with hallucinations long after the benefit of pattern matching might be lost.

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