I've tested this bug on three different mac computers. We can't get Premiere Pro (various different versions, from oldest 24.0 to newest 25.1) to recognize/import 360 video files. When we go to import the files, the folder where the 360 video files are stored, appears empty. This is true of both insta360 X3 files and X4 files.
It's a huge time and energy cost to have to downgrade contractors computers to previous MAC OS versions. I don't know if the bug is on Premiere Pro or Mac OS Sequoia. Really hoping for a resolution soon so I can continue working with new contractors who are on Sequoia.