This is a spin-off from bug 87129. With control being pressed the functionality of clone formatting is modified. Those modifications have to fed back in the cursor in order to clearly indicate it to the user.
Repro in Calc and Writter Version: 7.6.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: c4a58634753a84b09f20f7271d6525a6656522d3 CPU threads: 4; OS: Windows 10.0 Build 19045; UI render: Skia/Raster; VCL: win Locale: fr-FR (fr_FR); UI: fr-FR Calc: CL threaded