When editing a longer formula in LibreOffice Calc’s input line, tooltips hide parts of the formula close to the editing cursor. Tooltips appear once the editing cursor is set to a part of the formula where help is available, but it does not appear when hovering over the formula (in this case, an additional tooltip with just “Input line” appears.
Happens with ArchLinux, LibreOffice 6.2.4.2.0+, build id 6.2.4-1, UI renderer GL, VCL: kde5