ADDITIONAL SYSTEM INFORMATION :
Linux: Pop!_OS 22.04 LTS
openjdk version "23.0.1" 2024-10-15
JMC release: 9.1.1 (PLEASE UPDATE the releases listed in this bug form.)
Regression: 8.3.1+b05

A DESCRIPTION OF THE PROBLEM :
In JMC 8.3.1, my *.jfr file shows numbers in the Max Live Count column of the Memory table. Hovering over a number displays no pop-up.

In the latest, JMC 9.1.1, the same *.jfr file shows no data in the same Max Live Count column, and hovering over the blank data area displays a pop-up containing just an italics, "null".

REGRESSION : Last worked in version 8.2.1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Load a *.jfr file in JMC, and select Memory from the left column. Then see the Max Live Count column.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Data in the Memory report's Max Live Count column.
ACTUAL -
Blank.