Steam Version, Windows 11, 7-7-24 Build, In game name PoppingOff
If certain siege units (mangonels/Onagers/Bombard cannon units, etc.) have their stats altered (such as +5000 attack in the video) after researching a technology, the siege stats will reset back to default stats
Here is a video showcasing the bug: https://youtu.be/i2VSyZJw9y0
This bug has been around at least 7 years, since I last reported it to AOE 2 HD forums: Research technology siege bug AoE 2 HD :: Age of Empires II (2013) Support
Hoping to get this bug fixed, so these units can be added to a custom scenario
Thanks!