In both directions, connect in a Schengen country (or Croatia, Romania, Bulgaria or Cyprus), which don’t stamp UK passports as UK citizens cannot overstay there.
On the outbound trip, your child should deliberately clear entry immigration in the Schengen country with the Malaysian passport (getting an entry stamp) and then “re-exit” with the UK passport.
Then on the return trip, enter the Schengen country (can be a different one) using the UK passport, then “re-exit” with the Malaysian one (your child will have an entry stamp and so not face any issues).
This is so that it will appear to Malaysia that your child has been in the Schengen Area ever since departing Malaysia (by following the posted suggestion, there will be a gap in dates)
Credit:stackoverflow.com‘
4 Mar, 2024
5 Mar, 2024
4 Mar, 2024
5 Mar, 2024
5 Mar, 2024