Ok, I’ve manually updated to ( https://build.syncthing.net/repository/download/Syncthing_BuildLinux/78082:id/syncthing-linux-amd64-v1.9.0-rc.3.dev.1.g5d493ebe.tar.gz ) on devC.
Using:
export STTRACE=model,db
I’ve identified one file shown on the recent changes last X list:
[folder “install”]/Utilities/TestDisk_6.13/testdisk_win.exe
Filtering the log for that filename gives me:
[VPYAM] 2020/08/20 18:25:55.608727 folder.go:644: DEBUG: changing localflags on deleted item File{Name:"Utilities/TestDisk_6.13/testdisk_win.exe", Sequence:2721, Permissions:0555, ModTime:2020-08-17 15:44:39 +0200 CEST, Version:{[{LRORKSI 2} {VBHJ3YR 1597671879} {VPYAMUE 1595941224} {ZTMOUGV 1} {7E4EKDA 1}]}, Length:0, Deleted:true, Invalid:false, LocalFlags:0x8, NoPermissions:false, BlockSize:131072}
[VPYAM] 2020/08/20 18:25:55.608734 set.go:243: DEBUG: n4q4z-ohpfz GetGlobal(Utilities/TestDisk_6.13/testdisk_win.exe)
[VPYAM] 2020/08/20 18:25:55.623695 lowlevel.go:200: DEBUG: not inserting unchanged (local); folder="n4q4z-ohpfz" File{Name:"Utilities/TestDisk_6.13/testdisk_win.exe", Sequence:2721, Permissions:0555, ModTime:2020-08-17 15:44:39 +0200 CEST, Version:{[{LRORKSI 2} {VBHJ3YR 1597671879} {VPYAMUE 1595941224} {ZTMOUGV 1} {7E4EKDA 1}]}, Length:0, Deleted:true, Invalid:false, LocalFlags:0x0, NoPermissions:false, BlockSize:131072, Blocks:[], BlocksHash:}
This file isn’t present on disk. When I started Syncthing after the upgrade, I made sure the node had no connection to other Syncthing nodes and kept it offline.