need pointers,

I have SFMC journey which is using DE and email based template ( in email template amp script I am updating on flag based field on my payload) as next step I would like to use that flag value in decision element to trigger another follow up email template but before decision element value coming as NULL , wondering why isServiceEmailRequired boolean is NULL as I can it is updated to DE properly (True) as part of UpdateDE ?

basically I would like to trigger second email template based on this value . ( it seems Journey will not consider previous updateDE update ?

this is amp script UpdateDE code of Order confirmation email Email

enter image description here

I triggered first template based email ( Order confirmation email) and then I expect amp script code into to updateDE

SET @updateStatus = UpdateDE(“MH_OrderConfirmationTest”, 1, “OrderNumber”, @OrderNumber, “IsServiceEmailRequired”, @isServiceEmailRequired, “BookingStatus”, @successBooking)

I can see in DE value of isServiceEmailRequired is True setup but in next step I am observing it is NULL ,

basically I want to trigger my next email based template ( Service email ) when isServiceEmailRequired is true only.

is there any other way to do this ?