Wifi problems after fortigate and FAP firmware upgrade

[TenderBucket]

Hello

i did a firmware upgrade on a fortigate 300D cluster from 5.4.5 to 5.4.10 (upgradepath has been followed)

then i updated the FAPs from 5.2 to 5.4.1 (221B)

but now connection issues are being encounter on specific SSIDs.

the ones that are using tunnel traffic mode

SSIDs who use local bridge as traffic mode are working properly.

Does anyone have an idea of how i can solve that issue ?

Thank you =)