Relevant successful helper execs and registration write opens.
Linux x86_64, packaged Electron, isolated XDG directories, generic backend.
Private paths, environment addresses and thread IDs normalized; no other trace rows included.

Launch 1: initial launch
77840 04:11:51.034089 openat(AT_FDCWD, "$XDG_DATA_HOME/icons/com.t3tools.T3Code.desktop.png", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 40
77840 04:11:51.039000 openat(AT_FDCWD, "$XDG_DATA_HOME/applications/com.t3tools.T3Code.desktop", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 40
77840 04:11:51.383384 rename("$XDG_CONFIG_HOME/mimeapps.list.8T0OY3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
78576 04:12:00.905276 execve("/usr/bin/update-desktop-database", ["update-desktop-database", "$XDG_DATA_HOME/applications"], <environment> ) = 0
78602 04:12:04.020017 execve("/usr/bin/xdg-mime", ["xdg-mime", "default", "com.t3tools.T3Code.desktop", "x-scheme-handler/t3code"], <environment> ) = 0
78602 04:12:04.066135 openat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 9
78608 04:12:04.160623 renameat2(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list", RENAME_NOREPLACE) = -1 EEXIST (File exists)
78608 04:12:04.160929 renameat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list" ) = 0
79507 04:12:20.192454 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment> ) = 0

Launch 2: unchanged relaunch
80122 04:12:32.676329 rename("$XDG_CONFIG_HOME/mimeapps.list.ZX6TY3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
81835 04:12:52.447342 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment> ) = 0

Launch 3: missing MIME cache
82490 04:13:06.827066 rename("$XDG_CONFIG_HOME/mimeapps.list.DR41Y3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
82710 04:13:08.980842 execve("/usr/bin/update-desktop-database", ["update-desktop-database", "$XDG_DATA_HOME/applications"], <environment> ) = 0
82721 04:13:09.087274 execve("/usr/bin/xdg-mime", ["xdg-mime", "default", "com.t3tools.T3Code.desktop", "x-scheme-handler/t3code"], <environment> ) = 0
82721 04:13:09.168074 openat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", O_WRONLY|O_CREAT|O_TRUNC, 0666 ) = 9
82736 04:13:09.245380 renameat2(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list", RENAME_NOREPLACE ) = -1 EEXIST (File exists)
82736 04:13:09.248948 renameat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list") = 0
83532 04:13:20.512278 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment> ) = 0

Launch 4: stale MIME cache
84100 04:13:31.781441 rename("$XDG_CONFIG_HOME/mimeapps.list.FVZRY3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
84495 04:13:37.516838 execve("/usr/bin/update-desktop-database", ["update-desktop-database", "$XDG_DATA_HOME/applications"], <environment> ) = 0
84498 04:13:37.648981 execve("/usr/bin/xdg-mime", ["xdg-mime", "default", "com.t3tools.T3Code.desktop", "x-scheme-handler/t3code"], <environment>) = 0
84498 04:13:37.800177 openat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", O_WRONLY|O_CREAT|O_TRUNC, 0666 ) = 9
84504 04:13:37.948754 renameat2(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list", RENAME_NOREPLACE) = -1 EEXIST (File exists)
84504 04:13:37.949043 renameat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list") = 0
85566 04:13:43.830501 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment>) = 0

Launch 5: changed desktop entry
86057 04:13:52.383782 openat(AT_FDCWD, "$XDG_DATA_HOME/applications/com.t3tools.T3Code.desktop", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 42
86057 04:13:52.478012 rename("$XDG_CONFIG_HOME/mimeapps.list.LJ2MY3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
86232 04:13:54.042871 execve("/usr/bin/update-desktop-database", ["update-desktop-database", "$XDG_DATA_HOME/applications"], <environment> ) = 0
86358 04:13:56.392975 execve("/usr/bin/xdg-mime", ["xdg-mime", "default", "com.t3tools.T3Code.desktop", "x-scheme-handler/t3code"], <environment> ) = 0
86358 04:13:56.428178 openat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", O_WRONLY|O_CREAT|O_TRUNC, 0666 ) = 9
86373 04:13:56.474201 renameat2(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list", RENAME_NOREPLACE ) = -1 EEXIST (File exists)
86373 04:13:56.475660 renameat(AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list.new", AT_FDCWD, "$XDG_CONFIG_HOME/mimeapps.list" ) = 0
87001 04:14:03.148714 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment>) = 0

Launch 6: changed default
87637 04:14:12.929976 rename("$XDG_CONFIG_HOME/mimeapps.list.KXOZY3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
88548 04:14:25.622694 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment>) = 0

Launch 7: damaged persistent icon
89152 04:14:37.829364 openat(AT_FDCWD, "$XDG_DATA_HOME/icons/com.t3tools.T3Code.desktop.png", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 42
89152 04:14:38.010145 rename("$XDG_CONFIG_HOME/mimeapps.list.1NTLY3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
90695 04:14:57.396571 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment>) = 0

Launch 8: unchanged after repair
91331 04:15:09.072804 rename("$XDG_CONFIG_HOME/mimeapps.list.ILEKY3", "$XDG_CONFIG_HOME/mimeapps.list") = 0
92119 04:15:18.393149 execve("/usr/bin/xdg-mime", ["xdg-mime", "query", "default", "inode/directory"], <environment> ) = 0