RC18: dragged document displays incorrectly

When the editor is displaying a folder and its documents, when I drag another document into the folder, it is not displayed correctly. No huge deal: Ctrl+[ Ctrl+] fixes it. See pic. Consistent.

Same error when editor is not split. Same error in different test project.

Version: Beta (1204128) 64-bit - 17 Feb 2021

Device name ENVY
Processor AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx 2.00 GHz
Installed RAM 8.00 GB (6.96 GB usable)
Device ID 4BC47271-AC82-4EA8-A9E8-D2169DC2DF9C
Product ID 00325-96479-83670-AAOEM
System type 64-bit operating system, x64-based processor
Pen and touch Pen and touch support with 10 touch points

Edition Windows 10 Home
Version 20H2
Installed on ‎6/‎12/‎2020
OS build 19042.804
Experience Windows Feature Experience Pack 120.2212.551.0