Unable VLANs allowed after Upgrade firmware Fortios 7.6.0 - 7.6.3

[nebredav]

After upgrading the firmware FortiOS Fortigate 60F from version 7.4.7 to 7.6.0, only the native VLAN is available for use. Allowed VLANs no longer function on the FortiSwitch ports.

Ports with two "Allowed VLANs" configured are not working or are unavailable. Only the "Native VLAN" works.

Later versions 7.6.1, 7.6.2, 7.6.3 don't fix it.

I have to downgrade  to firmware version 7.4.7 for it to work successfully.

I will wait for a correction to that Bug.

[HarryTran]

Hi @nebredav 
Thanks for your info, let me give a try.

I would love to have the configuration files before and after the upgrade, I will compare them. Would you please share them to me via my official email thiep@fortinet.com.
Thank you.