Hi, responding here as well for others who may read these comments. During troubleshooting via my Discord, it turned out the user was not using [CGMZ] Pixi Filters but another plugin author's filter plugin instead.
I did test for ~15 minutes and did not notice the issue with my plugin, and since no one else has brought this to my attention before I believe it is not an issue with [CGMZ] Pixi Filters. There is no guarantee the issue doesn't affect my plugin, as the user states it seemed to happen randomly after a very long time in some cases, which is very difficult to troubleshoot without a confirmed case of it occurring with my plugin.
Please feel free (anyone) to respond here if this issue is noticed in the [CGMZ] plugin but for now I believe this is not an issue with my plugin.