Resetting taxonomies when used in conjuntion with Tax Access Control

I am using Taxonomy Access control to keep certain roles from using certain taxonomies. There appears to be a conflict with the Volunteer Timeslots module, but I'm not sure which module needs to be fixed. Here's my problem:

1. User A creates an event with volunteer timeslots (Node 1), and tags it with Term A. (only User A has access to use Tag A)
2. User B logs in and views the volunteer timeslot node (Node1) that User A created. (User B cannot see Tag A because he doesn't have access to it)
3. User B checks a timeslot and submits the form for Node 1.
4. Term A is removed from Node 1, apparently because User B submitted without access to this term.

This is a problem for me because I use these taxonomies to filter my events into specific calendars. What is effectively happening here is that unprivileged users are creating changes to taxonomies on a node, thus changing their behavior. Is it possible to prevent Volunteer Timeslots from making any changes to a node other than whatever is associated with storing the timeslot's checked state?

I hope this makes sense. This is the only thing right now that prevents me from using this module.

Thanks!