'-bash: line 1: rescanscsi: command not found' error even though script location is in PATH and other script runs fine from same folder

I'm new to linux, trying to switch over from Windows, and I could really use some help. This is actually my first time using a forum such as this so please forgive any errors I make. I'm using Linux Mint XFCE 64-bit and I have two scripts located in /usr/local/bin/custom, as can be seen as follows:

-shellsession
dasaint@X1:~$ which load-ssh-keys
/usr/local/bin/custom/load-ssh-keys

dasaint@X1:~$ which rescanscsi
/usr/local/bin/custom/rescanscsi

dasaint@X1:~$ whereis rescanscsi
rescanscsi: /usr/local/bin/custom/rescanscsi

dasaint@X1:~$ whereis load-ssh-keys
load-ssh-keys: /usr/local/bin/custom/load-ssh-keys

/usr/local/bin/custom is in my global path, as has been set in /etc/environment

-shellsession
dasaint@X1:~$ echo $PATH
/home/dasaint/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/local/bin/custom:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

Yet when I run rescanscsi, I get the following error:

-shellsession
dasaint@X1:~$ sudo rescanscsi
sudo: rescanscsi: command not found

The strange thing is, if I run sudo /usr/local/bin/custom/rescanscsi it works just fine. And if I run the other script, load-ssh-keys, without specifying the absolute path, it also works just fine. The contents of the scripts are:

-bash
#! /usr/bin/bash
#
# /usr/local/bin/custom/rescanscsi
#
# ReScan all SCSI/SATA Hosts
#
for SHOST in /sys/class/scsi_host/host*; do
    echo -n "Scanning ${SHOST##*/}..."
    echo "- - -" > ${SHOST}/scan
    echo Done
done

and

-bash
#! /usr/bin/bash
#
# Script:		load-ssh-keys.sh
# path:			/usr/local/bin/scripts
# Purpose:		add SSH private keys into ssh-agent
# Dependencies:	'/usr/bin/expect'
#				'/usr/bin/ssh-add'
# 
# '/usr/bin' must be included in the system path
#
# SYNOPSIS
# --------
# Reads the passphrase from '~/keypsph' and stores it in the variable, 'PSPH', then
# calls '/usr/bin/expect' to spawn ssh-add to add the SSH private keys into 
# ssh-agent and provide (send) the passphrase for the keys, followed by a .
#
# '/usr/bin/expect'  can be installed with:
#	sudo apt install expect
#
# Guide:	https://stackoverflow.com/questions/13033799/how-to-make-ssh-add-read-passphrase-from-a-file 
#
# Initialize a variable to store an exit code of '0'
EXITCODE=0
#
# Check whether the passphrase file, 'keypsph' exists in the user's home directory. 
# If not terminate the script with an appropriate message and error code.
if [ ! -f ~/.ssh/keypsph ]; then
    echo -e "ERROR: Passphrase file not found in $HOME/.ssh\nExiting..."
    exit 1
fi
# Read the passphrase from file, 'keypsph'
PSPH=$(cat ~/.ssh/keypsph)
#
# Call '/usr/bin/expect' to spawn ssh-add to add the SSH private keys to X2 into 
# ssh-agent and provide (send) the passphrase for the keys, followed by a .
expect .
expect .
expect .
expect << EOF
spawn ssh-add "$HOME/.ssh/x1-x8_key"
expect "Enter passphrase for /home/dasaint/.ssh/x1-x8_key:"
send "$PSPH\r"
expect eof
EOF
# Error Handling...
if [[ $EXITCODE != 0 ]]; then
  echo -e "Error adding x1-x2_key to SSH Agent\nExiting..."
  EXITCODE=$?
  exit $EXIITCODE
fi
#
# Exit the script with the appropriate exit code
exit $EXITCODE

I have searched the internet for answers but no one seems to have a comparable issue. I am at my wits end and I could really use some advice. **PS:** If I log in as root using su - and run rescanscsi without the absolute path, it also runs just fine.