I have exactly the same problem, but I am not using Litespeed cache. My site is on Siteground and I use ther SG Plugin. Last friday I got this error message in the log 850 times during one hour. I have not been able to reproduce the error by emptying the cache or any other way. At the moment of the error logs there was no activity on the site from customers or admin.
2024-08-30T23:52:12+00:00 Waarschuwing Lege patronen ontvangen van de PTK Pattern winkel 2024-08-30T23:52:15+00:00 Waarschuwing Lege patronen ontvangen van de PTK Pattern winkel 2024-08-30T23:52:31+00:00 Waarschuwing Lege patronen ontvangen van de PTK Pattern winkel 2024-08-30T23:52:32+00:00 Waarschuwing Lege patronen ontvangen van de PTK Pattern winkel