Out of curiousity today I had a look at a work unit that has been Pending Validation for a little longer than most, but not yet over-due.
This is it :-

	
Workunit Status

Project Name:		OpenPandemics - COVID 19
Created:		05/24/2020 08:56:36
Name:		OPN1_0000428_02230
Minimum Quorum:		2
Replication:		2
	
Result Name	OS type	OS version	App Version Number	Status	Sent Time	Time Due /
 Return Time	CPU Time / Elapsed Time (hours)	Claimed/ Granted BOINC Credit
OPN1_ 0000428_ 02230_ 1--	Linux Ubuntu	Ubuntu 18.04.4 LTS [4.15.0-101-generic|libc 2.27 (Ubuntu GLIBC 2.27-3ubuntu1)]	-	In Progress	5/26/20 10:40:48	6/2/20 10:40:48	0.00	0.0 / 0.0
OPN1_ 0000428_ 02230_ 0--	Linux Fedora	Fedora release 32 (Thirty Two) [5.6.14-300.fc32.x86_64|libc 2.31 (GNU libc)]	717	Pending Validation	5/26/20 10:40:26	5/26/20 18:05:14	3.40	66.2 / 0.0

Mine is the one shown as pending...
To my surprise it is showing "Fedora release 32" as the OS. It was NOT release 32 when this WU was submitted - but release 31. I only updated this machine a few hours ago - May 31 to release 32. So this Status screen show the current OS - NOT the OS that produced the work unit, as well as the incorrect kernel and clib versions obviously, some what mis-leading to some extent... Checked WUs for another machine just updated and WUs submitted and Valid before the update have also changed OS version