Why the Tag "$DISPLAY_AGE_END_TEMP" work on your Fermentation.htm report, but not work in report like Brewsheet.htm or NewRecipe.htm?
I don't think that's a valid tag. The $DIPLAY_AGE_TEMP is valid, but shows the starting temperature for that step. There is an associated bug that the start date for $TERTIARY_STEP and $BOTTLING_DATE are the same. Which means the tertiary time
is not added to the timeline before bottling in 3 step profiles.
EDIT: In 4 step profiles, the $BOTTLING_DATE reflects both tertiary and bulk age times added together. Tough luck displaying the bulk ageing, though. There don't appear to be any purpose tags for bulk ageing start date, total time or temperature. The $AGE tag references the maturation time after bottling/kegging.
One possible workaround is to create a 4 stage profile with the bulk age at 0 days. This lets you set the tertiary to include bulk ageing days and have the bottling date correctly set to the end of that time.
This bug was reported in August 2021 with Brad saying he was prioritizing a patch. I have no idea what the status of that patch is.