I’m still encountering the same behavior with Kaspersky Endpoint Security 10 for Windows.
I’ve reported it today as well but this can take time, obviously.
My workaround currently is to downgrade to syncthing version 0.14.29 (with the file syncthing-windows-amd64-v0.14.29.zip).
This version is not removed by Kaspersky (as of now), v.30, .31, and .32rc2 are removed.
I hope Kaspersky doesn’t add v.29 to their signature database…