And in the name of moving towards a new story for the character, continuing an old one, or only taking bits from past work, that's the call made by DC and the writers working on the character.
To accept that and find the old character in it while seeing the new is a call made by you, me, and other readers. And specifically with a character as new and not Batman, Superman, and Wonder Woman as Jon, he's still "cooking" and by the nature of being a child in comics is personifies the idea not being totally tethered to completely to his conception.
I myself still see that kid from Lois and Clark and Superman (2016) issue 1 in this guy. That's genuinely what made the moment where he escapes the volcano so cathartic and impacting for me. Him being cut off from the likes of his mom, Damian, and, most of all, his dad, yet digging deeper than he ever has before and rising to the occasion doesn't work for me unless I've read his story up to this point.
But if you didn't get the same take away, that's totally fine. I just don't think it's an inherent flaw in the the work because myself and others still came away with the feeling.