Already tested an Issue with Research technology trigger. It does not work if the building that researches it does not exist. This leads to unpleasant bugs for Alaric 2 and probably other campaigns as well.
I opened this campaign scenario in the scenario editor and testing it the tech was only researched if the trigger also built a castle, Removing the castle in the same trigger did not work though. Changing the tech location to one of the pavillions, which would be the best option, did also not work.
What did work is deleting the castle with kill object, although this leads to a spot of vision appearing where the castle once stood. This effect can be noticed by players and reported as bug as well. I recommend fixing the research tech trigger.
Might as well post my bug report 3 years ago that still has not been fixed…
If you try to used the arrow keys on the editors save scenario screen on the filename textbox, it locks your input/position.
(It is tracked thankfully, but honestly, I wish they would fix it already. There is a known work around by hitting alt+f4 and clicking no when it asks for you to close the game.)