Strange behaviour of jpg files with AI-generated content

Recently I have used the "Generative Fill" feature, then either saving a copy in JPG format or exporting as JPG. I have noticed some strange behaviour with these files: while they will open in my normal JPG display program if I double-click them in Windows Explorer, if (again in Windows Explorer) I search for *.jpg, they are not listed. Also, they do not sync with my Synology NAS (the error is "unsynced due to invalid filename or attributes"), and the "attrib" command shows that they have attributes P and U (pinned and unpinned). Files saved in TIF format behave normally, and opening one of the files in my standard JPG display program (Irfanview) and then saving as a new filename gives me a file that behaves normally. Prior to Generative Fill being released I experimented with it using Photoshop Beta, and files I generated with that did not behave in this way; however, the new Photoshop Beta (25.2) behaves the same.  I'm running Windows 11 and Photoshop 25.1.0.