I also went though the Silica bag burst saga... Unfortunately it not ending after replacing the expansion tube. I had my heater matrix replaced as well, since the heating has stopped working completely. This fixed the issue for a while, but now the problem is back again - there is so much of this stuff all over the system. I had it flushed a few times with water and the heater matrix is still getting cluttered.
To make it even worse, the car overheated on the highway because of broken segment connecting to the coolant pipe, right before the entrance to the cabin... Not sure if it is related, but this issue looks like never ending hell.
One more thing I noticed is that ever since the heater matrix started getting vlocked i am getting reading for the Oil temperature (I enabled the display using Carista) as much as 130 degrees. Before i was never going above 110.
Skoda Octavia 1.6 TDI 2014 'Mit Silicat'