Confirmed - Reproduced issue with Boron Shipyard in Ocean of Fantasy.
I was able to do a smooth zoom in/out on the Equipment Dock but when I tried the same on the Shipyard I got a stepped zoom in (1 level only) and then could not zoom either in or out from that point.
In addition Split Shipyard has significantly reduced zoom in/out.
Perhaps this could be due to the shear size of the stations and hardcoded limits in the game? Will check this theory against the Asgard when I get a chance (as the Asgard is about the size of the new Boron Shipyard)
The Paranid shipyard also has significantly reduced zoom in/out, but it is about double (or triple) the zoom capability of the Split Shipyard
I checked the Asgard, zoom is limited to about 4 or 5 times the Split Shipyard's zoom.
Hope all this helps clarify the problem.
Also the Argon shipyard has the same problem as the Boron Shipyard.
From this it seems that the larger the station the less zoom capability you have, but this seems to not apply as much to the large ships such as the Asgard.