That would be a limitation, not a bug 
System Requirements:
What are the minimum system requirements?
Operating system: 64-bit Windows 7 - 10, Apple OS X 10.8 - 10.10, or 64-bit Linux with at least glibc 2.13.
CPU: x86-64 Intel or AMD; at least one 2 GHz core for SD, 2 cores for HD, and 4 cores for 4K.
GPU: OpenGL 2.0 that works correctly and is compatible. On Windows, you can also use a card with good, compatible DirectX 9 or 11 drivers. We do not have a list.
RAM: At least 4 GB for SD, 8 GB for HD, and 16 GB for 4K.
Hard drive: yes, get one; the bigger, the better 
Network: Shotcut does NOT require access to the network to activate, check a subscription, or send usage analytics. However, some links in the Help menu do link out to this web site. If you have files on a fast (at least 1 Gb/s) network share you can access them from there through your operating system.