For example, when I select the current Sydney VTC on the EFB I use, there is no depiction of the vertical dimensions of the YSBK airspace, no matter how far I zoom in. However, if I select the ‘mega’ chart, it does depict “D 1500/SFC” inside the YSBK CTR boundary. I have been caught out by this precise difference.
Select the Bankstown Inset. I do note that there isn't a black line on the VTC indicating that the inset actually exists, but it is in the map list.
How could you be caught out? If a particular chart doesn't have what you want ie the CTR vertical dimensions, choose a chart that does.