Supermodel losing window focus (solved?)

For some reason Supermodel seems to be losing window focus roughly five minutes after starting up, and this behaviour is consistent. It's not specific to my computer either as I tested on my mother's laptop and it does the same thing. According to a program that tracks window focus it's explorer.exe that's stealing focus, and sure enough Supermodel doesn't lose focus after five minutes if I close explorer.exe. But I haven't had any other programs lose focus five minutes after starting, so what's going on? Has anyone else experienced this?
I'm currently testing older builds of Supermodel to see if the same problem occurs; all builds back to SVN 838 lose focus.
UPDATE: Even Supermodel 0.1.1a loses focus.
UPDATE 2: I should point out that I'm running Windows 10 version 20H2. Also Supermodel does not lose focus if I go into input configuration mode.
I'm currently testing older builds of Supermodel to see if the same problem occurs; all builds back to SVN 838 lose focus.
UPDATE: Even Supermodel 0.1.1a loses focus.

UPDATE 2: I should point out that I'm running Windows 10 version 20H2. Also Supermodel does not lose focus if I go into input configuration mode.