obs_frontend_set_current_scene crashes if not used in Studio Mode

Platform

Operating system and version: Windows 10 v1909 Build 18363.1016
OBS Studio version: 25.0.8 (64 bit)

Expected Behavior

I'm using a Lua script to automatically change a scene after a certain period of time - see link here: https://gist.github.com/woganmay/78bad7577b52d0fbf09b2cefcd8a131f

I'm expecting that, after switching to Scene A, that OBS will automatically switch to Scene B after 5000 milliseconds. The callbacks and countdown timer work normally, and the scene does transition if I'm in Studio Mode.

Current Behavior

If I trigger this script while not in Studio mode, OBS will crash when attempting to call obs_frontend_set_current_scene. If I'm in Studio Mode, the scene switches normally.

Steps to Reproduce

1. Load the Lua plugin linked above
2. Create Scene A, Scene B and a third scene
3. Without Studio Mode enabled, switch to Scene A and wait 3 seconds
4. OBS becomes unresponsive and has to be force-quit
5. Re-launch OBS, enable Studio Mode, stage Scene A and Transition to it
6. Within 3 seconds, the current scene switches to Scene B

Video: https://www.youtube.com/watch?v=ljFxT26Pi9g

Additional information

None

Start by reproducing the crash with the linked Lua script and obs_frontend_set_current_scene while Studio Mode is disabled, then compare the same call with Studio Mode enabled. Done means the current scene changes without OBS becoming unresponsive or crashing in either mode.