What happened?

Panic while starting after upgrade to v1.27.4 (manual build).
Used Go versions: 1.21, 1.22, build command:
CGO_ENABLED=1 CGO_LDFLAGS="-lumem" go run build.go -no-upgrade -cc gcc build
and just go run build.go -no-upgrade -cc gcc build (wo flags, result the same, but watching is not supported).

Synced paths contain latin, cyrillic and greek symbols (if it might help).

(panic log is too long to place into form)
panic-20240306-123313.reported.log

Syncthing version

v1.27.4

Platform & operating system

Solaris/Illumos x86 (omnios-r151046-d2b54a0125)

Browser version

No response

Relevant log output

No response