I was waiting for 2026.2 to be released before posting something about this.
2023, and 2024, do seem to be ok with macOS as far as showing thumbnails goes.
Anyone who doesn’t have 2023 or 2024 could go in and turn off all of the Quick look entries, download 2024, open it enough to get to the welcome screen, then close it. By then the 2024 Quick look entry should be in place, and is enabled.
The thumbnails may not show up immediately, but if you hold Option, right-click on the Finder icon in the Dock, and choose Relaunch, thumbnails will show up.
You would want to keep 2024 installed, but you don’t need to use it, 2026 thumbnails will be working as well.