It's very surprising that there hasn't been any information about the funeral and burial. Even Prince Wenzel who died under similar circumstances had a high profile funeral.
Perhaps the grief, shock, and disbelief was too much to bear and Princess Marie requested a private funeral ...
According to Liechtensteiner Vaterland, a mass for his soul will be said in Vienna on January 13, 2024, and a mass will be said in Vaduz on January 26. I think these will be more public.
A mass in memory of Prince Constantin will take place on Friday.
The population can be present at this mass on Friday, January 26th.
According to the cathedral parish website, mass in his memory will take place at 11 a.m. at St. Florin Cathedral in Vaduz.
A second 'seelenmesse' (soul mass) was held in Vaduz today at 11 am (a previous one was held in Vienna). While most seats were reserved for invited guests, it was open to the public according to Vaterland.