MSFS Singapore Changi (WSSS) - Bangkok Don Mueang (VTBD) full flight Longitude BeyondATC premium

Full flight from Singapore Changi (WSSS) to Bangkok Don Mueang (VTBD) in stock Citation Longitude, using BeyondATC premium voices, with FSLTL model matching.
I thought I'd do a longer flight, more suited for the longitude, on a part of the world I rarely fly. As neither Singapore nor Bangkok airport was included in the premium deluxe edition or in any world updates and I did not download external versions of them, the taxi and parking data was way off from the ones on the actual charts, luckily ATC did not mind my taxi transgressions, so it was a minor issue. What starts to bother me more is that BATC is pretty late issueing descent instructions and chose to ignore a number of altitude constraints from the STAR. Of course ATC officers have the right to overrule the charts, but I had to do quite a dive to be able to get where I was supposed to be when descent instruction finally came. I hope this gets fixed sooner rather than later.
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