Started a new character on Siptah a week ago and built a Nest of Zath on an 8x8 sandstone foundation with a room height of three blocks. I had no issues as this was plenty of space in order to support the altar’s size and I generally build by bases around the maximum expected size of a religious altar.
This week, I was finally in a position to upgrade all my building pieces to tier 3 - using stormglass walls and frontier foundations.
In order to replace the foundations under the Nest of Zath, I moved the Nest outside while I finished replacing all the foundations.
When I attempted to put the Nest of Zath back in place, I was met with the message “Overlapping with another object or terrain” despite the 8x8 room being empty.
I tried rotating, increasing and decreasing the height and changing the axis of the altar but to no avail.
I then deconstructed the Nest of Zath to try and place the altar that way but was still left with the message “Overlapping with another object or terrain”.
Finally, I deconstructed all my foundations and changed them back to Sandstone, only to be met with the message “Overlapping with another object or terrain”, despite the fact that I had no problem placing the altar on the 8x8 foundation a week ago.
Lastly, as a final test, I tried placing down other similarly large objects on the 8x8 foundation base. This included the tier 3 Wheel of Pain and the even larger tier 3 animal pen, all of which could be placed with no issues.
I am aware there was an update between the time I originally placed the Nest of Zath and the time I got around to upgrading foundations so I do wonder if this is a new bug that has recently arisen.
Looking for advice as the situation is slightly frustrating.