Crop not previewing correctly on duel monitor setup

[#1]

I have a dual monitor setup, and since the latest update, the 2nd monitor no longer shows the correct crop until after I have applied the crop.  The second monitor view is set to Loupe, Normal, but it doesn't make any difference if I use any other combination of settings either.

Lightroom  Classic Version 10.0 release.

Win 10 Pro
32Gb Ram
NVIDIA GeForce CTX970
i7-5820K CPU @ 3301 Mhz, 6 Cores

[#2]

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.

[#3]

Thanks
BTW, I have experimented with hardware acceleration off and on, but no difference.
What isn't in the system info is that my images are on a Synology NAS via a Gigabit network switch

Lightroom Classic version: 10.0 [ 202010011851-ef6045e0 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Business Edition
Version: 10.0.18363
Application architecture: x64
System architecture: x64
Logical processor count: 12
Processor speed: 3.3 GHz
SqLite Version: 3.30.1
Built-in memory: 32668.1 MB
Real memory available to Lightroom: 32668.1 MB
Real memory used by Lightroom: 2973.7 MB (9.1%)
Virtual memory used by Lightroom: 4323.7 MB
GDI objects count: 699
USER objects count: 2506
Process handles count: 1978
Memory cache size: 19.8MB
Internal Camera Raw version: 13.0 [ 610 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 1621MB / 16334MB (9%)
Camera Raw real memory: 2276MB / 32668MB (6%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 2560x1440, 2) 2560x1440
Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No

Graphics Processor Info:
DirectX: NVIDIA GeForce GTX 970 (26.21.14.3064)

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: F:\Lightroom Catalogues\Lightroom Cataloge 17-10-2012-2-2-2-2-v10.lrcat
Settings Folder: C:\Users\Woofypics\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) ColorChecker Camera Calibration
3) Facebook
4) Flickr
5) Nikon Tether Plugin
6) Perfect Effects 8

[#4]

This probably needs to be posted in the official Adobe Feedback forum, where actual Adobe Techs pay attention

https://feedback.photoshop.com/topics/lightroom-classic/5f5f2093785c1f1e6cc40872?cType=PROBLEM&page=...

At least one posting already exist to a similar problem, if it is the same, you should add yours to it

https://feedback.photoshop.com/conversations/lightroom-classic/lightroom-classic-secondary-display-l...

[#5]

Operating system: Windows 10 - Business Edition
Version: 10.0.18363

From; https://helpx.adobe.com/lightroom-classic/system-requirements.html

WINDOWS OS Requirement: Windows 10 (64-bit) 1903 or later, that would be build 18362

so your build 18363 (v 1909) is Ok

Graphics Processor Info:
DirectX: NVIDIA GeForce GTX 970 (26.21.14.3064)

So NVIDIA GeForce GTX 970 driver v 430.64 At NVIDIA, current GPU  driver is v457.30

Try updating your GPU driver. use the NVIDIA GeForce Experience utility to do so, select custom install type as to force a clean install.

Displays: 1) 2560x1440, 2) 2560x1440

As you are not running 4K, using graphics processor (/preferences/performance/) may not help, and might hurt, is it off or on?