yt:playlist:playlistID populates only first 20 songs

I have Mopidy + Local + YouTube + YT + Iris running on RPi 4B/4GB. The OS is latest 64-bit with GUI released in Jan. 2022.
yt:playlist:playlistID populates only first 20 songs. How can I increase this number? What is the limit? Multiple playlists, of not more than 20 songs, is a workaround that is working. Thanks in advance for all your help. Do let me know if you need any further info or logs to help me.