Hello. Thank you for your message, and I'm sorry you're experiencing issues.
Let's go step by step:
Regarding Visustella: Unfortunately, no, as I’ve mentioned several times before, all their plugins are encrypted, so there’s no way to know how their methods and functions are made, which makes compatibility adjustments really complicated.
Let me explain: I've already mentioned this in other responses to other users, but I’ll explain again: This plugin modifies many aspects of how RPG MAKER MZ works, mainly because RPG MAKER doesn't have a way to have "Independent" items, let’s say it groups them together as such. With the plugin, specifically with the Patch, what we do is create virtual and unique instances for each item. Basically, imagine you get 3 Weapons with ID: 02: ShortSword, What RPG Maker MZ then interprets is that you have:
Virtual ID 10000: ShortSword Virtual ID 10001: ShortSword Virtual ID 10002: ShortSword
And so on for each item you have. Basically, it forces each item to be unique and non-replicable.
This causes many changes in how RPG MAKER MZ works and can present some issues. I’ve updated the plugin several times to refine and improve the system. Regarding the bug you mentioned, I need you to give me more information about the issue so I can verify it in my environment and work on it. I need to be able to replicate it.
To do that, I ask you to send me a DEMO of your project (it can be a new one or your current project) including the error replication, I must be able to see exactly what happens and replicate your issue, and I need access to open the project to see how it's configured.
Make sure to include everything necessary. Send it to me using the form on my Support page: https://undermax.online/undermax/support.html
I'm at your disposal. Regards!