I also wonder about this for myself. My feeling is that my debug skills are also atrophied a bit. But I would split debugging into two buckets:

1. Debugging my own code or obvious behavior with other libraries.

2. Debugging pain-in-the-ass behavior with other libraries.

My patience with the latter is significantly less now, and so is perhaps my skill in debugging them. Libraries that change their apis for no apparent reason, libraries which use nonstandard parameter names, libraries which aren’t working as advertised.