scipy: BUG: beta.pdf is broken on main (1.11.0.dev0)

Describe your issue.

beta.pdf has changes from 1.10 to the 1.11.0.dev0 build and now returns incorrect results.

Reproducing Code Example

import numpy as np
from scipy import stats

xx = np.array([0.        , 0.11111111, 0.22222222, 0.33333333, 0.44444444, 0.55555556, 0.66666667, 0.77777778, 0.88888889, 1.        ])
k = np.array([0., 1., 2., 3., 4.])
n=4.0

pdf = stats.beta.pdf(xx[..., None], k + 1, n - k + 1)


np.testing.assert_allclose(pdf[-1,-1],5.0)

Passes on 1.10.0, fails on 1.11.0.dev0.

Error message

AssertionError: 
Not equal to tolerance rtol=1e-07, atol=0
Mismatched elements: 1 / 1 (100%)
Max absolute difference: 5.
Max relative difference: 1.
 x: array(0.)
 y: array(5.)

SciPy/NumPy/Python version and system information

1.11.0.dev0+1817.98c51a6 1.23.5 sys.version_info(major=3, minor=11, micro=2, releaselevel='final', serial=0)
{
  "Compilers": {
    "c": {
      "name": "gcc",
      "linker": "ld.bfd",
      "version": "10.3.0",
      "commands": "cc"
    },
    "cython": {
      "name": "cython",
      "linker": "cython",
      "version": "0.29.34",
      "commands": "cython"
    },
    "c++": {
      "name": "gcc",
      "linker": "ld.bfd",
      "version": "10.3.0",
      "commands": "c++"
    },
    "fortran": {
      "name": "gcc",
      "linker": "ld.bfd",
      "version": "10.3.0",
      "commands": "gfortran"
    },
    "pythran": {
      "version": "0.12.1",
      "include directory": "C:\\Users\\runneradmin\\AppData\\Local\\Temp\\pip-build-env-024pp_ot\\overlay\\Lib\\site-packages/pythran"
    }
  },
  "Machine Information": {
    "host": {
      "cpu": "x86_64",
      "family": "x86_64",
      "endian": "little",
      "system": "windows"
    },
    "build": {
      "cpu": "x86_64",
      "family": "x86_64",
      "endian": "little",
      "system": "windows"
    },
    "cross-compiled": false
  },
  "Build Dependencies": {
    "blas": {
      "name": "openblas",
      "found": true,
      "version": "0.3.21.dev",
      "detection method": "pkgconfig",
      "include directory": "/c/opt/64/include",
      "lib directory": "/c/opt/64/lib",
      "openblas configuration": "USE_64BITINT= DYNAMIC_ARCH=1 DYNAMIC_OLDER= NO_CBLAS= NO_LAPACK= NO_LAPACKE= NO_AFFINITY=1 USE_OPENMP= SKYLAKEX MAX_THREADS=2",
      "pc file directory": "c:/opt/64/lib/pkgconfig"
    },
    "lapack": {
      "name": "openblas",
      "found": true,
      "version": "0.3.21.dev",
      "detection method": "pkgconfig",
      "include directory": "/c/opt/64/include",
      "lib directory": "/c/opt/64/lib",
      "openblas configuration": "USE_64BITINT= DYNAMIC_ARCH=1 DYNAMIC_OLDER= NO_CBLAS= NO_LAPACK= NO_LAPACKE= NO_AFFINITY=1 USE_OPENMP= SKYLAKEX MAX_THREADS=2",
      "pc file directory": "c:/opt/64/lib/pkgconfig"
    }
  },
  "Python Information": {
    "path": "C:\\Users\\runneradmin\\AppData\\Local\\Temp\\cibw-run-cgdr6yw7\\cp311-win_amd64\\build\\venv\\Scripts\\python.exe",
    "version": "3.11"
  }
}