Hold off on those logs, just realized a mistake with the logs from that other thread: Failed items and "access is denied" in a Receive Encrypted folder - #17 by imsodin
Actually, the changed file here is a mistake in a change I made for 1.18.4-rc.1: lib/model: Write trailer when shortcutting on recv-enc (fixes #7991) by imsodin · Pull Request #7992 · syncthing/syncthing · GitHub.