Hiding tooltip on matrix row headers while keeping the tooltip for values (November 2023 edition)

I've built a matrix visualization similar to this one, with stepped layout turned off:

I've created a custom tooltip report page, which is currently displaying when moving the mouse over the values section, however in the row headers I still see the default tooltip which is not really providing value - and is actually quite annoying since it covers the information.

How do I disable the tooltip on the row headers while keeping the tooltip on the values?

It's the same issue as described here: Solved: Turn off Black tooltips on Matrix when using a Rep... - Microsoft Fabric Community but the solution to set transparency to 100% is not an option for me: I don't see that if I click on row or column headers, I'm not sure if it's a version issue.