Here is the OS and version information
Libre Office Versions
Version: 25.2.1.2 (X86_64) / LibreOffice Community
Build ID: d3abf4aee5fd705e4a92bba33a32f40bc4e56f49
CPU threads: 8; OS: Windows 11 X86_64 (10.0 build 26100); UI render: Skia/Raster; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: threaded
Windows
OS Name Microsoft Windows 11 Home
Version 10.0.26100 Build 26100
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
Version: 25.8.1.1 (X86_64) / LibreOffice Community
Build ID: 580(Build:1)
CPU threads: 8; OS: Linux 6.16; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
25.8.1-2
Calc: threaded.
Linux
OS: EndeavourOS
Kernel: 6.16.8-arch2-1
Note that I was able to paste into the cells today so this issue may have self corrected.