FITS loading fails in current GIT

Siril version: current git master Operating System: Debian Linux stable

Loading FITS (in this case a stack result) fails with error message:

free_image_data() called, clearing loaded image
log: FITS error: failed to find or open the following file: (ffopen)
log: FITS error: /mnt/ssd-480g/Arp316_2020-04-20_(124x300s_RCD).fit
log: Opening /mnt/ssd-480g/Arp316_2020-04-20_(124x300s_RCD).fit failed.
MODE: closing single image

The actual fits file seems to be OK, I can open it in GIMP, export as TIFF and then load this TIFF in Siril.

This might be related to the recent changes regarding FITS compression? I have compression disabled in preferences.

Regards, Steffen