Oracle 19c breaks mod_plsql for binding large arrays (flexible parameters) of your own type
For what it's worth, I thought I'd share my last 3 days (and nights) of debugging this and coming up with the solution/workaround...
tl;dr; someone really messed up WPIUTL for mod_plsql. Remove the bug "fix" 26148849 and add the old code from 12c there instead, which removes the prefix for the logged on user - and you're good to go again.
Wallt-of-text:
If you use Oracle HTTP Server with mod_plsql, and upgrade your database to 19c, you'll encounter errors if using your own PL/SQL tables as in-parameters, like for (!)flexible parameters (name_array, value_array), and trying strings larger than 1499 characters.