First of all, thank you for your kind words. I'm very happy that I can help others by maintaining this mod.
I have just checked this problem in-game. From my end, I can't see an issue with the preview. Those green lines with the ship names (<!-- code line -->) are comments to clear up which line corresponds to which ship in the game. I added those to make it easier and quicker for me to update the mod for upcoming updates. It also makes finding specific easier for others. I attached an updated version of the mod below; however, the only change was fixing that comment line.
If you still have any issues with the preview, can you post a comment in detail, as others and I may figure out the issue?
Thank you for bringing up the problem.
The ship_id_str of T9 Pan-Asian Cruiser Tianjin has been fixed to match the Developer API.
(Adding this here just in case, because it surprised me when I was just looking for the issue. If Mengchong's camo does not match the one seen in the preview image in the tech tree, it is most likely because of the settings of the "special camo filters" in the gear icon on the bottom right of the port screen.)
all_ships_in_tech_tree_13_1_2.rar