fall

*sigh* i really should have thought of that honestly

happened to me with 3 urls on linux, probably os- or setup-specific in that case

ended up writing a patch to fix this, in a separate mod since i have no idea how to work with this codebase, so here it is, for reference there's...

Can confirm that PR fixes it, probably the best solution since a delta with a solid color, unchanging background isnt gonna be less data than the original frame.