I too am getting this issue. Every time I try to drag a tab to an external monitor I get the pinwheel of death and have to force close the program. This doesn't happen using other browsers like Edge.
Version 0.99.130.1-beta (WebKit 621.1.2.111.4)
Build date Dec 19 2024
MacBook Pro (macOS Sequoia 15.1.1 build 24B91)