You need to enable the breadcrumbs in Rank math > General Settings > Breadcrumbs for the breadcrumbs to be shown
Please note that some options are only available when you enable the Advanced Mode in Rank Math. We give you an option to choose between the two during the setup wizard and you must have chosen to use the Easy Mode.
You can switch to the Advanced Mode from the top-right corner at WordPress Dashboard > Rank Math > Dashboard
Here is a screenshot for reference:
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
What a weird thing! At least, you got it working, those are good news! Then, do you have any other questions? Or do you want us to close this thread? In any case, we will be here if you have any other questions or issues in the future.