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I noticed this after an update of my Manjaro 20.2.1 system, which bumped Xfce up to v 14.16.0 and the panel to v 14.16.1 (from what previous versions, I'm not sure);

When using a background image for a panel located at the bottom of the screen (instead of selecting the theme's colors or a solid color via "Panel Preferences"), there is a 1 pixel upward displacement of the majority of the panel, to the left of the notification/system tray area - leaving a visible 1 px "step" between the panel and tray elements.

This may have something to do with the vertical shifted, dotted & pulsing 1 px red border around the panel while tweaking via "Panel Preferences"; elements correctly line up to accommodate the red-dotted border as long as "Panel Preferences" is open/active, but as soon as it's closed, only the notification area(s) drops back into the proper position - the rest of the panel erroneously remaining raised by 1 pixel.

I've tried different images - both .png & .jpg - tweaked most/all settings in "Panel Preferences" and tried multiple panel re-starts & system re-boots - all to no avail.

Forum moderator ToZ confirmed the same behavior here: https://forum.xfce.org/viewtopic.php?pid=61753 - but also mentioned the issue doesn't occur when using a panel at the top of the screen.

Below is attached an image of what I'm seeing, as well as an example panel background image that I'm using;

Background .png image;

Some system info;

inxi -F

System:    Host: hp-6730b Kernel: 5.10.13-2-MANJARO x86_64 bits: 64 Desktop: Xfce 4.16.0
           Distro: Manjaro Linux
Machine:   Type: Laptop System: Hewlett-Packard product: HP Compaq 6730b (KS178UT#ABA)
           v: F.20 serial: <superuser required>
           Mobo: Hewlett-Packard model: 30DD v: KBC Version 96.23   
CPU:       Info: Dual Core model: Intel Core2 Duo P8600 bits: 64 type: MCP
           L2 cache: 3 MiB
           Speed: 804 MHz min/max: 800/2401 MHz Core speeds (MHz): 1: 804 2: 823
Graphics:    Device-1: Intel Mobile 4 Series Integrated Graphics driver: i915 v: kernel
           Display: x11 server: X.Org 1.20.10 driver: loaded: intel
           unloaded: modesetting resolution: 1280x800~60Hz
           OpenGL: renderer: Mesa DRI Mobile Intel GM45 Express (CTG) v: 2.1 Mesa 20.3.4