Text colour in Data Validity help box

Hello. I have an issue with Data Validity. When using the Data Validation ‘Input Help’ , the box where the help text should appear seems empty. On closer inspection, it was actually a very pale yellow background with white text, making the text almost invisible. I have changed the background colour, but the text remains white. How can I change the colour of this text to black [or any other colour] ?
Could this be linked to using dark mode ?
[LO 24.2.7.2 on Linux Mint 22.2]