"pm2 update" never ends when running it from a bash script

What's going wrong?

I'm running a script that install/updates many things including PM2, but when I try to update it. the script just freezes and I had to manually terminate it.

However, when I run the same commands directly on the terminal, it works fine.

How could we reproduce this issue?

Create a script with the following content:

npm install pm2@latest -g
pm2 update

And run it from the console

sudo bash that_script.sh

Having pm2 already installed, we update it and we end up having a different version on the local computer and on memory.
the pm2 update doesn't finish.

Supporting information

--- PM2 report ----------------------------------------------------------------
Date                 : Fri Feb 26 2021 15:34:51 GMT-0300 (Uruguay Standard Time)
===============================================================================
--- Daemon -------------------------------------------------
pm2d version         : 4.5.4
node version         : 12.20.1
node path            : not found
argv                 : /usr/bin/node,/usr/lib/node_modules/pm2/lib/Daemon.js
argv0                : node
user                 : root
uid                  : 0
gid                  : 0
uptime               : 333min
===============================================================================
--- CLI ----------------------------------------------------
local pm2            : 4.5.5
node version         : 12.21.0
node path            : /usr/bin/pm2
argv                 : /usr/bin/node,/usr/bin/pm2,report
argv0                : node
user                 : root
uid                  : 0
gid                  : 0
===============================================================================
--- System info --------------------------------------------
arch                 : x64
platform             : linux
type                 : Linux
cpus                 : Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
cpus nb              : 6
freemem              : 683810816
totalmem             : 6222090240
home                 : /root
===============================================================================
--- PM2 list -----------------------------------------------
┌─────┬───────────────────────┬─────────────┬─────────┬─────────┬──────────┬────────┬──────┬───────────┬──────────┬──────────┬──────────┬──────────┐
│ id  │ name                  │ namespace   │ version │ mode    │ pid      │ uptime │ ↺    │ status    │ cpu      │ mem      │ user     │ watching │
├─────┼───────────────────────┼─────────────┼─────────┼─────────┼──────────┼────────┼──────┼───────────┼──────────┼──────────┼──────────┼──────────┤
│ 0   │  bacon_health_check    │ default     │ 1.0.0   │ fork    │ 53344    │ 4m     │ 0    │ online    │ 0%       │ 46.3mb   │ root     │ disabled │
└─────┴───────────────────────┴─────────────┴─────────┴─────────┴──────────┴────────┴──────┴───────────┴──────────┴──────────┴──────────┴──────────┘
===============================================================================
--- Daemon logs --------------------------------------------
/root/.pm2/pm2.log last 20 lines:
PM2        | 2021-02-26T15:30:05: PM2 log: Stopping app:bacon_health_check id:0
PM2        | 2021-02-26T15:30:05: PM2 log: App [bacon_health_check:0] exited with code [0] via signal [SIGINT]
PM2        | 2021-02-26T15:30:05: PM2 log: pid=923 msg=process killed
PM2        | 2021-02-26T15:30:05: PM2 log: App [bacon_health_check:0] starting in -fork mode-
PM2        | 2021-02-26T15:30:06: PM2 log: App [bacon_health_check:0] online

Does anybody know why this is happening?

Thanks in advance!!

Start by reproducing the issue with the shown npm install pm2@latest -g and pm2 update commands under sudo bash, then compare that behavior with running the commands directly in a terminal. Use the reported PM2 daemon and CLI version mismatch as the initial lead; done means pm2 update exits normally from the script.