Random yellow pixel appear when exporting as png

[filipcve]

Steps for minimal example:

1. Open Ipe.
2. Import pump.png
3. Export png

The resulting png will have yellow pixels near the top of the pump and end of hose. I can reproduce this problem both in the web version of Ipe (running in Zen - a fork of Firefox) and the Ipe flatpak running on nixos.

test.pdf

Pump icons created by Ylivdesign - Flaticon

Please let me know what other info I could provide to help. Thank you!