Does xrdp cache the wallpaper?

[StrykeSlammerII]

I have an issue that I suspect is XFCE, not xrdp, but I'm having trouble finding the cause so I thought I'd ask here and be certain.

I have a headless Arch/XFCE xrdp server that I connect to from a Win11 client (no other devices that I can easily test from).
A few months ago I did a system update on the server, including updating xrdp to 10.3; XFCE version is 4.20.

Previously when I overwrote the desktop wallpaper file, it would update immediately on my remote desktop.
Now I can change that file, but I have to manually go into settings and change away from, then back to, the original wallpaper in order for my desktop to show the updated image.

I'd appreciate if someone could confirm whether or not rdp is capable of caching the wallpaper on a workspace or desktop, and using that until the window manager explicitly updates it. [Please assume "window manager" is the correct term; I'm comfortable using Linux but I know I don't understand all the pieces!]

Dragging a window around the screen, changing workspaces, etc, all keep the old background--another reason I suspect it's not an xrdp issue. I have to explicitly go into my desktop settings and reselect the updated file there in order for the wallpaper to change.

I haven't seen any similar issues posted anywhere, and have been working with some Arch users with little luck so far on the XFCE side.
I did not note down exactly what was updated when I first noticed the new behavior 😦 it's also possible that I did multiple updates before noticing the issue. I waited a few months in case the issue would pop up somewhere, but still have not found anything similar.

I have zero technical understanding of how xrdp works (and little time or interest in learning it right now).
There's an option or something that got flipped somewhere on my install, and at this point it will turn out to be in the one system I don't check on 😅

I have not yet checked what happens if I login to the Arch machine locally. It's possible to do this, but time-consuming. Obviously if the issue occurs locally it is not caused by xrdp, so I can still try that to troubleshoot if necessary.

[matt335672]

We don't have anything to do with the desktop settings here, including the wallpaper. We work at a level below that.

I have to say, the current behaviour seems rational to me. Otherwise, the window manager (xfwm4 in this case) would have to be monitoring the background image for changes. Here are a couple of ideas:-

1. Try setting up a new user and see how that behaves, with default settings.
2. Have a look for anything in xfwm4-settings or xfwnm4-tweaks-settings which might cause this. I've just had a quick look myself, but I couldn't see anything.

HTH.

[StrykeSlammerII]

Thanks for the confirmation and suggestions. I'll keep digging on the xfce/xfwm side of things.
I agree the current behavior makes sense, but "it used to work!" (for years) and now it doesn't.