Task Manager gives low memory warning, but I’m nowhere near 100% usage

Here’s an example of the warning (grabbed when running Minecraft on OpenJDK with 8GB allocated, but I’ve seen the same happen when running other processes):

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I can check the performance statistics and see that my memory usage is roughly 8GB, half of the 16GB that my system has.

As another fun bonus, launching some programs (notably ones powered by Chromium – VSCode, Discord, MSEdge etc.) will either cause the window to hang, close, or produce a “Could not load page” error.

At this point, I’ll switch to Linux (yes that is a threat) if I can’t figure out what the problem is. What exactly can cause this sort of error to occur, is it fixable?