Yep webkit autoloader v0.5.1 hangs on splash screen and doesn't jailbreak consistently on 13.20
Upon rebooting it gets stuck at restarting the console screen requiring hard reset.
After trying for three times back to back it eventually jailbreaks.
Just one thing, just in case you are referring to something that has happened to me before and even on 13.60 on my PS5pro:
Sometimes, when the autoloader fails, it may hang or not but you kinda need to reboot because the JB doesn't happen. Ok...
I used etHEN binary used by ntFargo exploit only error messages at the and about 9020 and 9021 ports.
PS5 autoloader working properly now debug menu is correct also.
PS5 webkit autoloader debug menu is broken keeps saying Something went wrong when opening CE-100154-1 and it's missing a lot of options that were available with original ntfargo exploit.
User guide option was loading the default playstation page even with the dns set.
I used this this guide to jailbreak and had a good laugh.
Youtube Guide