I have the x-t5 and the H1 too but only with the X-T5 it happens what you has told. I discovered that if you set the Af-s the problem disappears. Only with the af-c with a half -press on the shutter button reveals tha maximum iso, otherwise with set the af-s it is shown the iso measured by the camera.
I see that nikon with 79 and last firmware has introduced the focus trap. The fuji x-t5 that is model corresponding in Aps-c format to Nikon Z9, should haave this feature.
How to set X-t5 to obtain the focus trap?
I would, for example, to set manually the focus at 3 meters and when a subjet enter in focus area at 3 meters of distance, the shutter takes a picture