Operating system: Linux-5.2.0-2-amd64-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: Quadro RTX 6000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.40
Broken: version: 2.81 (sub 11), branch: master, commit date: 2019-09-18 08:49, hash: rBe2cbf8b1174d
Short description of error
Going to edit mode makes links in node editor to disappear.
Exact steps for others to reproduce the error
Open attached file, go to object's edit mode.
Seems something to do with /* Add link to batch. */ code path. Forcing /* Draw single link. */ code math makes all links to properly display.