BUG: RecursionError when selecting single column from IntervalIndex #26490
- [x] closes #26490
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

#37150 is failing, this is the first of two orthogonal bugfixes in that PR