He didn't even suspect his mum who was Leviathan or grayson who was a Spy and is currently more traumatised than Jason. The whole thing is nonsense.
Same with the half a story of TT. The fact that Damian would attack Jason without evidence or even accept his help is OCC. Why would you go to someone who you view as a failure to help you overcome a failure.
It seems to me that DC is determined to ensure that Damian and Jason are just at loggerheads which is a shame but the even greater shame is that this is being achieved by throwing Damian under the bus and sabotaging his character.
He has been written by over 16 writers since Rebirth and it's under these new writers that he's stupid and when it comes to Jason.
If this is DC's idea of brotherly relationships then I'd rather they just stick to Dick and Damian at least that way no brother is getting ruined and the relationship is mutually beneficial.