Problem with missing execute permissions on files when installing miniconda (Linux)

I am having some strange problems with missing execute permissions on some files when installing the latest miniconda. Does anyone see what the problem is?

I am installing on this Linux system:

    -bash-4.2$ cat /etc/system-release
    CentOS Linux release 7.9.2009 (Core)
    -bash-4.2$ uname -a
    Linux 3.10.0-1160.80.1.el7.x86_64 #1 SMP Tue Nov 8 15:48:59 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

I am following the instructions at
with PREFIX=/scratch4/george/miniconda
(which is an NFS-mounted area I have write access to)

When the installation finishes, apparently successfully, conda init fails:

installation finished.
Do you wish the installer to initialize Miniconda3
by running conda init? [yes|no]
[no] >>> yes line 524: /scratch4/george/miniconda/bin/conda: Permission denied

It turns out some key files do not have execute permissions set:

-bash-4.2$ find /scratch4/george/miniconda/bin \! -perm -u+x -ls
107602865387    8 -rw-r--r--   1 george   hep5         6748 Feb  3 11:56 /scratch4/george/miniconda/bin/c_rehash
107602865395   20 -rw-r--r--   1 george   hep5        17016 Feb  3 11:56 /scratch4/george/miniconda/bin/lzmainfo
107602865255    4 -rw-r--r--   1 george   hep5          116 Feb  3 11:56 /scratch4/george/miniconda/bin/idle3.10
107602865257 16860 -rw-r--r--   1 george   hep5     17263360 Feb  3 11:56 /scratch4/george/miniconda/bin/python3.10
107602865258    4 -rw-r--r--   1 george   hep5         3494 Feb  3 11:56 /scratch4/george/miniconda/bin/python3.10-config
107602865287    4 -rw-r--r--   1 george   hep5          527 Feb  3 11:56 /scratch4/george/miniconda/bin/conda
107602865289    4 -rw-r--r--   1 george   hep5          288 Feb  3 11:56 /scratch4/george/miniconda/bin/deactivate

If I set these x perms by hand, conda init then works, but when I go i=on to create new environments I have this problem repeatedly with the x permission not set on a subset of the files that need it, often causing the installation of the env to fail.