I'll have to go in the Cavern to see if I can see/reproduce the bugs Phantom/GPNMilano are seeing. First descent in 2014 for me!
The marker issue:In URU:CC (including on Deep Island), the GZ marker is located a little bit on the right. (In MOUL, it's more centred on the balcony). I can see it and I was able to add it to my green markers quest.
@Phantom: you are right in saying the Baron's City Office is located right under that balcony BUT it's just a spatial thingy.
IC: the Baron's City Office is located half-way up the stalagmite hill between the plaza & the Bahro building (Guild Hall) over the huge curtain.
OOC: the Baron's City Office spatial location is right underneath the balcony shown on the picture (where I'm standing). The city is considered being an age and the Baron's City Office is considered being another age. There's no way that a marker showing up in one age for the game can be "visible" in another age, that's illogical.
So you must haven't seen the marker on the balcony (see my picture). There might have been a bug when you were there but it is definitely on the balcony in URU:CC (DI in extension).
The Bucket ride & door issue:I was able to ride the bucket easily and I was dumped unceremoniously from the bucket in the upper room of the huge dead shroom stump. You might have encountered a bug at the moment you played the age. I didn't use the /spawn command to move around.
The Sun power device issue:I checked in the lense and my sun is standing smack in the centre of the aim. It has been a long time since I went back in Teledahn and the gears & rods run smoothly without intermission. I did saw this bug once or twice but it was in MOUL. I don't think it has to do specifically with URU:CC (DI in extension) engine.