I had a visualization in 1.27 that showed a trend line with "difference from previous year" bars (per month) shown below.
When I open this viz in 1.28, the bars disappear. I can only make the difference appear if I use the same grain for the y axis and the previous period -- if y axis is by year, I can show a year over year difference, if y axis is by quarter, I can show a quarter over quarter difference, and if y axis is by month, I can show a month over month difference.
Is there a way to achieve the same functionality as before?