Cursor invisible in formula input box

[bugmaker]

Bought Softmaker Office a while ago and tried out Planmaker for the first time today. I immediately ran into a bug which makes the program very difficult to use.

When I click on a cell with a formula in it, the formula will show up in the "input box" (?) above the worksheet and below the menu ribbon. When I click on the formula in this input box, a blinking cursor shows up. All good.

But now when I scroll down in the worksheet, the cursor disappears. After scrolling, even if click again on the formula in the input box, the cursor does not show up. The cursor still seems to exist as I can type in the box just fine or move the cursor around by clicking or using the left / right arrow keys. But the cursor is completely invisible, which makes it very difficult to edit the formula.

Win11 pro, SoftMaker Office 2024.