Server status checker works wrongly with plugin ajQueue

[WitheredWinter]

When PlayerBalance works together with ajQueue(a plugin hold queue for player to join servers under bungeecord, to some extent like yours), PB can't check a server is online or not correctly.
In the config of PB in bungee server(I use Waterfall 1.20-562), when server-checker - tactic=CUSTOM, PB can find a backend server online correctly if the backend server is online when tactic is set to CUSTOM. But if the backend server gets offline and after a few seconds gets online again when tactic has been set to CUSTOM, PB will say that server is still offline.
And if you set server-checker - tactic=GENERIC, PB seems simply not checking the status of the backend server: If a server in a group is offline, it is possible that PB send you to the actually offline server in that group if you use a command like /spb connect bedwars-4v4v4v4 Starlight

OS: Ubuntu
Java 21 for the Bungee server
Software:Waterfall 1.20-562
PlayerBalancer version: 2.3.5
ajQueue version: 2.6.0

I report an issue here as ajQueue functions normally, but PB generates some exceptions.

[WitheredWinter]

by the way, I am sure that there's no errors or warns in the log