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After I upgraded to Magento 2.3.2 from 2.2.3 I noticed that the product grid was getting slow. I searched a bit and someone mentioned that MSI might be the problem. So I tried disabling it according to this link.

Right after that I am getting this error when I try to open a product in admin:

main.CRITICAL: Unable to serialize value. Error: - Malformed UTF-8 characters, possibly incorrectly encoded {"exception":"[object] (InvalidArgumentException(code: 0): Unable to serialize value. Error: - Malformed UTF-8 characters, possibly incorrectly encoded at /vendor/magento/framework/Serialize/Serializer/Json.php:58)"} []

I tried to reindex, to clear the cache, to set the admin locale to en_US and to redeploy static content, nothing helped. As soon as I enable MSI again, it works. Is there a way to at least get to know where the encoding goes wrong?

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