Update: fixed in 1.26.9, https://github.com/WofWca/jumpcutter/commit/bd85951bbc3b54193483626deb47ac6c0a1de231

Original response:
Thanks for the report! I've managed to reproduce it. Will try to fix.
I personally use this extension on PC only, so, sorry about that.
Track the issue: https://github.com/WofWca/jumpcutter/issues/122