Pixelated edges around trees and buildings, against clouds or background terrain, when Enhanced Atmospherics is active (note that LM note this feature as "Beta" and therefore still being improved upon)
Hardened platforms on custom bridges don't seem to work meaning road traffic drops to the ground/water level instead. Extrusion bridge platforms work OK.
The default road vector system is missing many tunnels and thus, outside of our regions, one will see roads crossing mountains.
The visual effects system has been changed and thus some dynamic effects (smoke, spray, lighting, etc.) may be oversized or display odd colors or have transparency issues.
[REGIONS + SOME AIRPORTS] Because all default airports have been made new and thus buildings, structures, and objects shifted around, it's likely that any third-party add-on that doesn't include an airport-wide object exclusion will now display duplicate or overlapping objects.
Airports that have had their ICAOs changed in the v5 database will need to be adjusted by us accordingly (in the Regions, in the Global Pack, as well as stand-alone airports), otherwise there will be two airports displayed in the same locations. There's no official change list from LM so it'll take us a bit to find and fix them all.
Not a bug but rather a design choice: LM no longer includes artificial smoothed areas in their terrain mesh files around airport flattens. This was done to allow for the implementation of sloped runways (though there are only a few in the default v5). However, this also means that many default airports (outside our Regions) will now have noticeable edges around their perimeters, similar to the effect when installing third-party terrain mesh files. Within our FTX Regions, our enhanced airports will continue to be properly blended.