Multi-line Text Box misleading text and cursor display

Starting with 365 Version 2603 on 4K monitor, in a multi-line text box, typing multiple words followed by line feeds (Enter key) then moving cursor back up to previous line causes trailing characters to disappear, entering characters at the end of the line shows the new character with the cursor in front of it, and other bizarre behavior.  Selecting all the text shows it is all there but trailing characters at the end of a line can disappear depending on cursor position.  If I change the monitor resolution to 2K, the issue goes away.  If I rollback to version 2602 the issue goes away.  This is an issue with version 2603 on 4K monitors.  We have many customers reporting the same issue.