Queue not staying as it is after closing and opening the app again

[Lyxxy]

Plan

Premium

Country

Singapore

Device

Samsung Galaxy S9

Operating System

Android 10

My Question or Issue

Lately, whenever I add tracks from an already downloaded playlist (let's call this playlist A) to my 'Queue' while listening to another playlist (let's call this playlist B), those queued tracks will disappear from the queue the next time I open the app and the app will only continue playing playlist B. I can see those playlist A tracks appear in 'Next in Queue' when I add them to the queue but after I close the app and open it again, that 'Next in Queue' list will disappear. Does anyone know how to fix this?