Boot Manager Not Found On First Reboot MDT Latitude 5591

On an updated MDT installation with ADK 1809, deploying Windows 10 v1809 on UEFI machines I'm having issues with one particular model (Dell Latitude 5591) where the laptop after the image has been applied boot's back from the USB containing the MDT Offline Media into WinPE and then of course throws a 'dirty environment found' warning' instead of booting from the SSD and resuming the rest of the task sequence. Other Dell laptops (like E5540, E5550 and E5570) do not have this behaviour and boot perfectly fine from the SSD. 

When removing the USB from the laptop, doing a force shutdown from WinPE and then booting again without USB, the laptop boots from the SSD and once the message 'getting everything ready' appears we can connect the USB again and the task sequence proceeds as expected (with several reboots). Also once booted up without the USB every other reboot during the task sequence is as expected booting from the SSD. 

Upon searching for this issue I came across a topic on this Dell community forum for another model and ADK version (https://www.dell.com/community/Enterprise-Client/5480-7480-set-to-UEFI-MDT-PXE-Boot-Loop-after-BIOS-Update/td-p/5182477) but the solution found there does not apply to ADK 1809 as the suggested modification of LTIApply.wsf is already there when using ADK1809. 

Anyone has an idea how this can be solved? 

Regards

Pieter