Potential issue with mod generator 1.12.2 for 2021.1, connected with loot tables

Hi, I decided to download this improved version of the original generator. I was making a mod addon for 1.12.2. There are a little more functions here. But I have a suspicion of a bug. I wanted to make a custom loot chest in a custom structure. There are no questions about the structures, but there were big problems with creating loot tables. I tried to do custom loot many times, used tutorials, wikis, forum, I figured out what to use blockdata on this version. But it didn't help, I used a neural network, double-checked the loot tables path in jar format: C:\Users\Bogdan\Desktop\New Folder\assets\roc\loot_tables\chests. I experimented with the command block and the command:  https://ibb.co/kgKqvXh3  .I have no options for what I did wrong, except what is wrong with the plugin for the 1.12.2 generator. If you know or can help with the creation of loot, then I will be eternally grateful to you. Just in case, I will leave this review here and have created a separate forum.  I hope for help, and if there really is a bug in the plugin, then the developers of the plugin (if they haven't stopped development, of course) will fix the bug. I understand that mcreator is a free project, without investments. They cannot update old versions, at least 1.12.2 - the cult versions with fantastic mods and potential for creating add-ons, other great mods. I understand that support is also free, and many staff are focused on new versions rather than the old ones. Therefore, I want to help myself and the brave developers who dared to create a plugin for supporting 1.12.2, and I hope for continued community support for old versions of Minecraft. Thank you for your attention!